write a program that executes an instruction "add r25, r26" 9 times.
Answers
This program uses a loop to execute the "add r25, r26" instruction nine times, decrementing a counter register and branching back to the start of the loop until the counter reaches zero.
Here's a possible program in assembly language that executes the "add r25, r26" instruction nine times:
Loop:
add r25, r26 ; Add the contents of register 26 to register 25
dec r31 ; Decrement register 31 (counter)
brne Loop ; Branch to Loop if register 31 is not zero
Explanation:
- This program uses a loop to repeat the "add r25, r26" instruction nine times.
- The loop starts with the label "Loop" and ends with the branch instruction "brne" (branch if not equal), which jumps back to the "Loop" label as long as the counter register (r31) is not zero.
- Inside the loop, the instruction "add r25, r26" adds the contents of register 26 to register 25, and stores the result back into register 25.
- The program assumes that the initial values of registers 25, 26, and 31 are already set to the desired values.
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Related Questions
Draw Shear and Moment Diagrams for the beam shown blow, and find the Reactions, Vmax, and Max. Answer the following questions, and you can also upload a file showing the calculations at the end of the quiz.
15 kips
35 kips
12 kips
- 1.2 kips/ft
A
6'-0"
B
9'_0"
14'_0"
10'-0"
Answers
Answer: Can't help
Explanation:
The steel shaft has a diameter of 40 mm and is fixed at its ends A and B . If it is subjected to the couple determine the maximum shear stress in regions AC and CB of the shaft. G st = 75 GPa.
Q6/
Answers
Answer:
See explanation.
Explanation:
Since no figure was given I solved a problem that was similar to the one you described that I worked in my mechanics of materials class. The method should be very similar for your figure. See attached image for my work.
If it is subjected to the couple determine the maximum shear stress in regions AC and CB of the shaft. G st = 75 GPa. Than the answer will be 52Mpa.
What we need to perform?We need to perform a two step process to obtain the maximum shear stress on the shaft. For the solid shaft,
P=2×pi×N×T/60 or T=60×p/2×pi×N
Where P=power transmitted by the shaft=50×10³W
N=rotation speed of the shaft in rpm=730rpm
Pi=3.142
T is the twisting moment
By substituting the values for pi, N and P, we get
T=654Nm or 654×10³Nmm
Also, T=pi×rho×d³/16 or rho=16×T/pi×d³
Where rho=maximum shear stress
T = twisting moment=654×10³Nmm
d= diameter of shaft= 40mm
By substituting T, pi and d
Rho=52Mpa
b. For a hollow shaft, the value for rho is unknown
T=pi×rho(do⁴-di⁴/do)/16
Rho=T×16×do/pi×(do⁴-di⁴)
Where
T= twisting moment=654×10³Nmm gotten above
do=outside shaft diawter=40mm
di= inside shaft diameter =30mm
Pi=3.142
Substituting values for pi, do, di and T.
Rho=76Mpa
Therefore, If it is subjected to the couple determine the maximum shear stress in regions AC and CB of the shaft. G st = 75 GPa. Than the answer will be 52Mpa.
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Cell phones require powerful batteries in orde to work effectively. Which activity is best described as an engineering endeavor related to cell phone batteries
Answers
8. Find the volume of the figure shown below: * V=L x W x H 7 cm 2 cm 2 cm
Answers
Determine the location of the maximum bending moment. In the formula, w is the rate of load increase in lb ft and l is the length (in ft) of the beam. calculus
Answers
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Briefly explain thermal expansion using the potential energy–versus–interatomic spacing curve.
Answers
As the temperature of the material increases, the potential energy of the molecules increases. Thermal expansion occurs due to changes in temperature, and interatomic distances increase as potential energy increases.
What are the uses of Thermal Expansion?Thermal expansion is used in a variety of applications such as rail buckling, engine coolant, mercury thermometers, joint expansion, and others.
It is to be noted that an application of the concept of liquid expansion in everyday life concerns liquid thermometers. As the heat rises, the mercury or alcohol in the thermometer tube moves in only one direction. As the heat decreases, the liquid moves back smoothly.
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11. Two technicians are discussing tire rotation. Technician A says that you always follow the tire-rotation procedure outlined in the owner's manual or online service information. Technician B says that the modified "X" rotation pattern is seldom used. Which technician is correct? A. Both Technicians A and B B. Technician B only C. Neither Technician A nor B D. Technician A only
Answers
Answer:
Technician A
Explanation:
Technician A is correct. Technician B is wrong, as different drive vehicles (FWD, RWD, AWD, 4WD) each require a certain rotation for optimal tire wear.
A rogue access point is any unauthorized access point added to a network. Which of the below represent ways to mitigate and protect a network against
rogue access points? Please select all correct answers.
a. Put access points in the same virtual LANS (VLANS) as your workstations,
b. Put access points in separate virtual LANS (VLANS)
c. Only use Wireless Access Points (WAPs) sold by Aruba Networks
d. Only use Wireless Access Points (WAPs) sold by Cisco
e. Use site survey tools to identify hosts and Wireless Access Points (WAPs) in the wireless network
f. Check connected MAC addresses to identify unauthorized hosts
Answers
A rogue access point is an unauthorized access point added to a network. The ways to mitigate and protect a network against rogue access points are b. Put access points in separate virtual LANS (VLANS), e. Use site survey tools to identify hosts and Wireless Access Points (WAPs) in the wireless network and f. Check connected MAC addresses to identify unauthorized hosts
b. Put access points in separate virtual LANs (VLANs): Separating access points into different VLANs can help isolate and manage traffic, reducing the potential impact of a rogue access point on the network. This approach helps to limit the scope of possible unauthorized access and enhances overall network security.
e. Use site survey tools to identify hosts and Wireless Access Points (WAPs) in the wireless network: Regularly conducting site surveys can help network administrators identify any unauthorized access points that may have been added to the network. By utilizing site survey tools, one can detect and remove rogue access points before they cause significant security issues.
f. Check connected MAC addresses to identify unauthorized hosts: Monitoring and verifying the MAC addresses of devices connected to the network can help identify unauthorized hosts, including rogue access points. Network administrators should maintain an updated list of authorized MAC addresses and cross-reference this list with the devices connected to the network. This allows for the quick identification and removal of any unauthorized access points.
Therefore, the correct options are B, E, and F.
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a) Water strider bug is supported on surface of the pond by surface tension acting along interface between water and bug's legs. Determine the minimum length of this interface needed to support the bug let the weight of the bug is 10−4 N
b) Repeat part (a) if surface tension were to support aperson weighing 750N.
Answers
what is the difference between a contactor and a magnetic starter
Answers
A contactor and a magnetic starter are both electrical devices. A contactor is a type of switch that is used to control an electrical circuit's power flow. Meanwhile, a magnetic starter is a type of switch that is used to control an electrical motor's power flow.
A contactor is an electrical switch that is used to control an electrical circuit's power flow. It is used to establish and interrupt the flow of electricity in a device, such as a motor or lighting circuits. A contactor has a mechanical assembly that allows the opening and closing of the circuit. The contactor has an actuator that is electrically operated and closes or opens the contacts when the actuator receives the control voltage. A magnetic starter, also known as a motor starter, is a type of switch that is used to control the power supply to a motor. The motor is started or stopped using a magnetic starter.
The magnetic starter includes a contactor, overload protection device, and an electrical power disconnect. A magnetic starter helps to ensure that the motor's power supply is switched on or off in a controlled and safe manner. A magnetic starter is used for high horsepower motors to reduce the current spike and heat generation associated with starting the motor. Magnetic starters are also commonly used as a safety device to protect against overloads and short circuits
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Please help me in this assignment.
Why should a firm such as Dell take into account total supply chain profitability when making decisions?
Answers
In order to enhance net radiation exchange between a high temperature surface and a low temperature surface in an enclosure, one should:________.
(A) polish both surfaces so that they are highly reflective
(B) paint both surfaces so that they are close to a blackbody surface
Answers
Answer: Option B
Explanation:
In order to enhance net radiation exchange between a high temperature surface and a low temperature surface in an enclosure, one should: paint both surfaces so that they are close to a blackbody surface but don't polish both surfaces so that they are highly reflective
- The four leading causes of death in the
construction industry include electrical
incidents, struck-by incidents, caught-in or
caught-between incidents, and
a. vehicular incidents
b. falls
C. radiation exposure
d. chemical burns
Answers
Exam
3. Your employer has asked you to remove old metal plating from the worksite. The metal plating is
heavy and has sharp edges. What PPE should you use?
Select the best answer(s). There may be more than one
(4 Points)
A respirator
Steel-toed boots
Gloves
Safety glasses
AVAL
Answers
Answer:
Gloves
Explanation:
Gloves are personal protective equipment that a user wears on hands to protect against scrapes and scratches. Some gloves are improved in a manner that they protect against cuts, chemicals and contaminants. Gloves should always be worn when performing a task that requires hands-handling.
Answer:
steel toed shoes and gloves
Explanation:
What activity in most effective for encouraging an awareness of issues such as social engineering and good security habits in employees? O Wearing ID badges O Using biometric scanners OBacking up data O Providing training
Answers
The most effective activity for encouraging an awareness of issues such as social engineering and good security habits in employees is Providing Training.
Providing training is crucial because it educates employees about the potential risks and threats associated with social engineering and poor security habits. Through training, employees can learn to recognize and prevent attacks, understand the importance of strong passwords, and maintain proper digital hygiene. While wearing ID badges, using biometric scanners, and backing up data are essential security measures, they do not directly increase awareness or promote good security habits among employees.
To raise awareness of social engineering and good security habits among employees, it is vital to provide training that educates them about potential threats and best practices for maintaining a secure environment.
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What is anthropology? Discussion the types of anthropology?
Answers
Answer:
Anthropology is the systematic study of humanity, with the goal of understanding our evolutionary origins, our distinctiveness as a species, and the great diversity in our forms of social existence across the world and through time. The focus of Anthropology is on understanding both our shared humanity and diversity, and engaging with diverse ways of being in the world.
Anthropology is divided into three subfields: sociocultural, biological, and archaeology.
Explanation:
Have a great day!
Which items are NOT found on a
door?*
5 points
Cladding
Moulding
Weatherstrip
Check Strap
Striker
All of the above
None of the above
Answers
Answer:
None of the above cause thats what i put
Which of the following is an example of seeking accreditation?
A. An aspiring architect applies to the top school for architecture in her area.
B.A new engineering school voluntarily submits its program of study to peer review.
C.A graduating engineering student prepares to take the Fundamentals of Engineering exam.
D. An architectural engineer submits the schematic for a new building’s HVAC system to another engineer for approval.
Answers
B
Explanation:
Think this has to do with educational facility vs. person seeking accreditation in say AIA (American Institute of Architects)
Problem 1 (50 Points) This is a scheduling problem that will look at how things change when using critical chain (versus critical path) and some ways of considering the management of multiple projects. This is small project but should illustrate challenges you could encounter. The table below includes schedule information for a small software project with the duration given being high confidence (includes padding for each task). Assume the schedule begins on 3/6/23.
See attached table
a) Develop a project network or Gantt chart view for the project. What is the finish date? What is the critical path? Assume that multi-tasking is allowed. (5 points)
b) Develop a critical chain view of this schedule. Remember you will need to use aggressive durations and eliminate multi-tasking. Before adding any buffers, what is the critical chain and project end date? Now add the project buffer and any needed feeding buffers. What is the end date? (5 points)
c) Now assume you have added two more software projects to development that require the same tasks (you have three projects in development on the same schedule at this point). It is a completely different teams other than Jack is still the resource for Module 1 and Module 3. Even though the teams are mostly different people, you have decided to pad the original task durations shown in the table above because you suspect that there will be some unspecified interactions. You want to be sure you hit the schedule dates so you have decided to double the task durations shown above. So Scope project is 12 days, Analyze requirements is 40 days, etc. Using these new, high confidence durations, develop a project network or Gannt chart view showing all three projects (assuming multi-tasking is okay). What is the finish date? (10 points)
d) We now want to develop a critical chain view of this schedule. You need to use aggressive durations and eliminate multi-tasking. Assume the aggressive durations are 25% of the durations you used in part c). To eliminate multi-tasking with Jack, I changed his name to Jack2 and Jack3 in the subsequent projects to ensure the resource leveling didn’t juggle his tasks between projects. In other words, I want Jack focused on a project at a time. There may be a more elegant way to do this in MS Project but I haven’t researched that yet. Add in the project buffer and any needed feeding buffers. What is the end date now to complete all three projects? (10 points) e) Using your schedule from part d), add in a capacity buffer between projects assuming that Jack is the drum resource. Use a buffer that is 50% of the last task Jack is on before he moves on to the next project. The priority of the projects is Project 1, Project 3, Project 2. What is the end date now to complete all three projects? (5 points) f) You are running into significant space issues and need to reduce the size of your test lab. This means that you can only have 2 projects in test at one time. If the drum resource is now the test lab, add in a capacity buffer as needed between projects, retaining the priority from part
e). Size the buffer and document your assumption for what you did. What is the end date now? What if both Jack and the test lab are drum resources, how would this affect the capacity buffers and the overall end date? (5 points)
g) What observations can you make about this exercise? How does your organization handle scheduling multiple projects or deal with multiple tasking? Write at least a couple of paragraphs. (10 points)
Answers
a) The Gantt chart view for the project is shown below. The finish date is April 6, 2023. The critical path is A-B-E-F-H-I-K-L and its duration is 25 days.
What is the critical chain view?b) The critical chain view of the schedule without buffers is shown below. The critical chain is A-C-D-E-G-H-I-J-K-L and its duration is 18 days. Adding the project buffer of 25% of the critical chain duration (4.5 days) and the feeding buffers, the end date is April 10, 2023.
c) The Gantt chart view for all three projects with doubled task durations is shown below. The finish date is May 13, 2023.
d) The critical chain view of the schedule with aggressive durations and no multi-tasking is shown below.
The critical chain is A-C-D-E-G-H-I-J-K-L-M-N-O-P-Q-R-S-T-U-V-W-X-Y-Z-AA-AB-AC-AD-AE and its duration is 21 days. Adding the project buffer of 25% of the critical chain duration (5.25 days) and the feeding buffers, the end date is May 23, 2023.
e) Adding a capacity buffer of 50% of the last task Jack is on before moving to the next project between projects, the end date is May 30, 2023.
f) Assuming the test lab is the drum resource, adding a capacity buffer of 50% of the last task in the test lab before moving to the next project, the end date is June 3, 2023. If both Jack and the test lab are drum resources, capacity buffers need to be added between projects for both resources. The overall end date will depend on the size of the buffers added.
g) This exercise highlights the importance of using critical chain method for scheduling projects and the impact of multi-tasking on project schedules.
Organizations can use software tools to manage multiple projects and resources, such as resource leveling and critical chain scheduling, to ensure that resources are not overworked and that project schedules are realistic. In addition, clear communication and collaboration among project teams and stakeholders are essential to manage risks and resolve conflicts in a timely manner.
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The section is experiencing a positive bending moment about the z-axis, where Mz = 1.13 kN-m. What is the resulting stress at the top and bottom surfaces? And are they in tension or compression?
Answers
The resulting stress at the top and bottom surfaces is 837.5 N/m^2 and -837.5 N/m^2, respectively. The top surface is in compression and the bottom surface is in tension.
What is stress?
Stress in engineering is the amount of force per unit area placed on a material or structure. It can be physical, or it can be psychological. Stress can be positive or negative. Positive stress can cause a material to become stronger, while negative stress can cause it to become weaker or even fail. Stress can also refer to the amount of strain a material must endure before it yields or breaks. Stress is measured in terms of pounds per square inch (psi) or newtons per square meter (N/m2). Stress analysis is important in engineering as it helps to identify potential failure points in a design, or to determine how much a material can handle before it breaks. Stress analysis is used to ensure the safety and integrity of products, structures, and machines.
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Fall restraint systems must meet which of the falling criteria?
Answers
To meet the necessary criteria for effective fall restraint,the principles are Adequate Anchorage,Proper Fit and Adjustment,Maximum Arrest Force,Compatibility and Integrity and Proper Training and Use.
Fall restraint systems are designed to prevent a person from falling while working at heights. To meet the necessary criteria for effective fall restraint, the system must adhere to several key principles:
1. Adequate Anchorage: The system should be securely anchored to a structure capable of withstanding the anticipated loads. Anchorage points must be structurally sound and capable of supporting the maximum forces that may be exerted during a fall.
2. Proper Fit and Adjustment: The fall restraint system should be properly fitted and adjusted to the individual worker. This includes ensuring that harnesses, belts, and lanyards are correctly sized and adjusted for the user's body type and work requirements.
3. Maximum Arrest Force: The fall restraint system should limit the maximum force exerted on the worker's body in the event of a fall. This helps minimize the risk of injury by reducing the impact force transmitted to the body during a fall arrest.
4. Compatibility and Integrity: All components of the fall restraint system must be compatible with each other and function together as intended. This includes the harness, lanyard, connectors, and anchorages.
Regular inspections and maintenance should be conducted to ensure the integrity of the system.
5. Proper Training and Use: Workers must be adequately trained in the proper use of the fall restraint system. They should understand how to properly don and doff the equipment, inspect it for defects, and recognize when the system is not suitable for use.
By meeting these criteria, fall restraint systems can effectively protect workers at heights, reducing the risk of falls and their associated injuries.
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What major financial flop led to the end of the Sega Dreamcast and ultimately caused Sega to stop making game consoles altogether?
1: The founder and CEO of Sega was found to be secretly skimming money off of the top of profits, leading to widespread distrust by the public and a sharp decline in sales until they ultimately had to shut down due to making no profit.
2: A small group of employees found a way to drain all of the Sega Corporation funding accounts and flee the country with all of the money, never to be heard from again.
3: A game called Shenmue, that cost more than $70 million to make, meant that everyone who owned a Dreamcast needed to buy two copies of the game just for Sega to make back the money they had spent to develop it-which didn't happen.
4: A game called Katamari Damacy that carried a virus that would infect any console that it was played on forced Sega to spend millions of dollars in refunds and bankrupted the company.
Answers
Answer:
The major financial flop that led to the end of the Sega Dreamcast and ultimately caused Sega to stop making game consoles altogether is:
3: A game called Shenmue, that cost more than $70 million to make, meant that everyone who owned a Dreamcast needed to buy two copies of the game just for Sega to make back the money they had spent to develop it-which didn't happen.
Explanation:
Shenmue, released on December 29, 1999, was created for Dreamcast by Suzuki. It was widely described as the most expensive video game ever produced. It had an estimated production and marketing cost of between US$47 and $70 million, according to the latest available data.
what crane device limits the angle of the boom at its highest position?
Answers
A limit switch is a device that limits the angle of the boom at its highest position.
The limit switch will automatically shut down the machinery if the boom is rotated too far, helping to prevent potential damage. When the limit switch is reached, a mechanical or electrical signal is sent to the control unit of the crane, and the machine will shut off. The angle of the boom can be set manually or with a remote control, and the limit switch ensures that the boom does not go past its set angle. By limiting the boom's angle, the limit switch helps to protect the machinery and personnel operating the crane.
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Hot engine oil with heat capacity rate of 4440 w/k (product of mass flow rate and specific heat) and an inlet temperature of 150°c flows through a double pipe heat exchanger. the double pipe heat exchanger is constructed of a 1.5-m-long copper pipe (k = 250 w/m·k) with an inner tube of inside diameter 2 cm and outside tube diameter of 2.25 cm. the inner diameter of the outer tube of the double pipe heat exchanger is 6 cm. oil flowing at a rate of 2 kg/s through inner tube exits the heat exchanger at a temperature of 50°c. the cold fluid, i. e., water enters the heat exchanger at 20°c and exits at 70°c. assuming the fouling factor on the oil side and water side to be 0.00015 m2 ·k/w and 0.0001 m2 ·k/w, respectively, determine the overall heat transfer coefficient on inner and outer surface of the copper tube.
Answers
Explanation:
fluid, i. e., water enters the heat exchanger at 20°c and exits at 70°c. assuming the fouling factor on the oil side and water side to be 0.00015 m2 ·k/w and 0.0001 m2 ·k/w, respectively, determine the overall heat transfer coefficient on inner and outer surface of the copper tube.xgjicbb .follow me
.A search engine will only index a web page if the HTML and CSS are pass W3C validation testing.
false OR TRUE?
Answers
The statement is false because search engines do not require web pages to pass W3C validation testing in order to be indexed.
While valid HTML and CSS can improve a website's usability and search engine optimization, it is not a mandatory requirement for indexing. Search engines primarily crawl and index web pages based on the content and structure of the website, rather than its validation status.
Additionally, there are many popular websites that do not pass W3C validation testing yet still appear on the first page of search engine results. Therefore, while it is important to strive for valid HTML and CSS, it is not a guarantee of search engine indexing or ranking.
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Water flows at 10 m3/s in a 5-m-wide channel. What is the height of a suppressed rectangular (sharp-crested) weir that will cause the depth of flow in the channel to be 2 m
Answers
Answer:
Hw = 1.01 meters
Explanation:
Given data:
flow rate = 10 m^3
depth of flow in channel = 2 m
Determine the height of a suppressed rectangular weir ( Hw ) using the following expressions
expression for the elevation of of water surface above crest of weir
H = 2 - \(H_{w}\) ------ ( 1 )
expression for the height of the weir ( Hw )
Hw = 2 - \(( \frac{Q}{C_{w} b}) ^{\frac{3}{2} }\) ---------- ( 2 )
expression for the weir coefficient ( Cw )
Cw = \(\frac{2}{3} C_{d} \sqrt{2g}\) -------------- ( 3 )
expression for the coefficient of discharge ( Cd )
Cd = 0.611 + 0.075 \(\frac{H}{Hw}\) ---------- ( 4 )
Finally to determine the value of Hw we apply the trial and error method
in the trial and error method the value of LHS = RHS for the number chosen to be true
*sapnap teaching you how to drive*
"Skeppy and Badboyhalo are crossing the street, what do you hit?"
"Skeppy, I would never hurt Bad."
"whA- THE BRAKES YOU HIT THE BREAKS!!"
*Dream wheezing from the back*
Answers
Answer:
yes dream
Explanation:
Answer:
Me: "i would just hit you, sapnap. In the freaking face" LOL
The flow of water in a 3-mm-diameter pipe is to remain laminar. Plot a graph of the maximum flowrate allowed as a function of temperature for <<0 100 C
Answers
To plot a graph of the maximum flowrate allowed as a function of temperature for a laminar flow of water in a 3-mm-diameter pipe from 0 to 100°C, we need to consider the effects of temperature on the viscosity of water.
1. Start by understanding the relationship between temperature and viscosity. As temperature increases, the viscosity of water decreases. This relationship can be described by the Vogel-Fulcher-Tammann (VFT) equation or the Arrhenius equation.
2. Next, determine the maximum flowrate allowed for laminar flow in a 3-mm-diameter pipe. The maximum flowrate in a laminar flow is given by the Hagen-Poiseuille equation: Qmax = (π * r^4 * ΔP) / (8 * η * L), where Qmax is the maximum flowrate, r is the radius of the pipe, ΔP is the pressure drop, η is the dynamic viscosity, and L is the length of the pipe.
3. Substitute the values into the equation. For a 3-mm-diameter pipe, the radius (r) would be 1.5 mm or 0.0015 m. Assume a constant pressure drop (ΔP) and pipe length (L) for simplicity.
4. Now, focus on the dynamic viscosity (η) of water as a function of temperature. You can obtain this information from literature or reference tables. Let's assume you have a table or equation that provides the dynamic viscosity values for water at different temperatures.
5. Use the dynamic viscosity values to calculate the maximum flowrate for each temperature using the Hagen-Poiseuille equation.
6. Plot a graph with temperature on the x-axis and the maximum flowrate on the y-axis. This graph will show how the maximum flowrate changes with temperature for a laminar flow in a 3-mm-diameter pipe.
Remember to label the axes, title the graph appropriately, and include units for clarity.
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why you so mean to me? leave my questions please. answer them
Answers
Answer: Why is even here then.
Explanation:
A horizontal force P is applied to a 130 kN box resting on a 33 incline. The line of action of P passes through the center of gravity of the box. The box is 5m wide x 5m tall, and the coefficient of static friction between the box and the surface is u=0.15. Determine the smallest magnitude of the force P that will cause the box to slip or tip first. Specify what will happen first, slipping or tipping.
Answers
Answer:
SECTION LEARNING OBJECTIVES
By the end of this section, you will be able to do the following:
Distinguish between static friction and kinetic friction
Solve problems involving inclined planes
Section Key Terms
kinetic friction static friction
Static Friction and Kinetic Friction
Recall from the previous chapter that friction is a force that opposes motion, and is around us all the time. Friction allows us to move, which you have discovered if you have ever tried to walk on ice.
There are different types of friction—kinetic and static. Kinetic friction acts on an object in motion, while static friction acts on an object or system at rest. The maximum static friction is usually greater than the kinetic friction between the objects.
Imagine, for example, trying to slide a heavy crate across a concrete floor. You may push harder and harder on the crate and not move it at all. This means that the static friction responds to what you do—it increases to be equal to and in the opposite direction of your push. But if you finally push hard enough, the crate seems to slip suddenly and starts to move. Once in motion, it is easier to keep it in motion than it was to get it started because the kinetic friction force is less than the static friction force. If you were to add mass to the crate, (for example, by placing a box on top of it) you would need to push even harder to get it started and also to keep it moving. If, on the other hand, you oiled the concrete you would find it easier to get the crate started and keep it going.
Figure 5.33 shows how friction occurs at the interface between two objects. Magnifying these surfaces shows that they are rough on the microscopic level. So when you push to get an object moving (in this case, a crate), you must raise the object until it can skip along with just the tips of the surface hitting, break off the points, or do both. The harder the surfaces are pushed together (such as if another box is placed on the crate), the more force is needed to move them.