College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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Transcribed Image Text:Friction
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11
A A Aa- Ao
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b x, x A 0.A-
目三三 三,-
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would you have to apply to get the car to start sliding? If you continued to apply this same
force, determine the acceleration of the car. If you pushed for 20 s, how far would the car
travel? (use dry concrete)
Materials
Steel on steel
0.74
0.57
Aluminum on steel
0.61
0.47
Copper on steel
Rubber on concrete (dry)
Rubber on concrete (wet)
0.53
0.36
1.0
0.8
0.3
0.25
Wood on wood
0.25-0.5
0.2
Glass on glass
0.94
0.4
Teflon on Teflon
0.04
0.04
Teflon on steel
0.04
0.04
Waxed wood on wet snoW
0.14
0.1
Waxed wood on dry snoW
0.10
0.04
Metal on metal (lubricated)
Ice on ice
0.15
0.06
0.1
0.03
Synovial joints in humans
Very rough surfaces
0.01
0.003
1.5
DELL
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Coefficient of Kinetic Friction
Name:
1.) A football sled of mass 300 kg is pushed by football players with a force of 2800 N. If the
coefficient of static friction between the grass and sled is 0.9, determine if the sled moves or
not. Explain. If the sled moves determine the acceleration of the sled. (coefficient of kinetic
friction = 0.6)
2.) A physics student (90 kg) on skis is pulled horizontally across the dry snow with a rope. If there
is friction according to the value below (waxed wood on dry snow), determine the force
necessary to accelerate the student at 2 m/s².
3.) The driver of a car (1100 kg) traveling at 30 m/s on dry concrete sees a deer in the distance and
slams on the brakes and skids to a stop. How far does the car travel before stopping?
4.) You find an abandoned car in a Walmart parking lot. The car is locked. You look up the car on
Kelly's Blue Book and find the mass to be 1200 kg. You go and push the car. How much force
would you have to apply to get the car to start sliding? If you continued to apply this same
force, determine the acceleration of the car. If you pushed for 20 s, how far would the car
travel? (use dry concrete)
Materials
DELL
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- Q5arrow_forward2. A 10-kg block, initially at rest, is at the top of a rough plane inclined at 10°. The coefficient of kinetic friction between the block and the incline is 0.1, the coefficient of static friction is 0.5. a) What minimum force (magnitude and direction) will start motion of the block down the incline? Present free-body diagram. Motion started, applied force disappears and block is moving on its own. As the block slides down the incline: b)Find the acceleration of the block, present free-body diagram c) Determine the magnitude and the direction of the force of friction acting on the block. d)Calculate the change in the potential energy of the block, after it slides 3m down the incline.arrow_forwardQUESTION 2 A 20-kg crate is initially at rest on a level floor. A maintenance worker attaches a light, uniform rope to the crate and pulls on the rope so that the tension is 120 N and is parallel to the ground. As a result, the crate accelerates at a constant rate of 1.5 m/s-. What is the coefficient of static friction between the crate and the floor? а. 0.80 b. 0.92 С. О.34 d. 0.68 е. 0.46arrow_forward
- 6. A cable is pulling on box B, causing both boxes to move together to the right. Make a free-body diagram of block A a. if the table is frictionless, and b. if there is friction between block B and the table and the pulling force is equal in magnitude to the friction force the table exerts on block B. B Horizontal table Pullarrow_forward3. You are pulling two small children on a sleigh over level snow. The sleigh and children have a total mass of 47 kg. The sleigh rope makes an angle of 23⁰ with the horizontal. The coefficient of kinetic friction between the sleigh and the snow is 0.11. Calculate the magnitude of the tension in the rope needed to keep the sleigh moving at a constant velocity. please hand write it clearlyarrow_forwardA physics textbook is placed on an inclined slope with an adjustable angle a. The coefficients of friction between the book and the slope are us = 0.5 and uk = 0.35 %3D respectively. 1m a (i) Initially the book is not moving. Copy the diagram and draw all the forces acting on the book. Show mathematical expressions for the size (magnitude) of each force. If we slowly increase the angle a, at what angle does the book start sliding? (ii) Use the Work-Energy theorem to find a formula (expression) for the speed v of the book when it reaches the bottom, in terms of the angle a.arrow_forward
- you need to push the couch 4 m to the other side of the room. After the initial push to get it going you push on the 90 Kg couch with a steady horizontal force of 600 N. The coefficient of kinetic friction between the couch and the floor is 0.6. 1) what is the magnitude and direction of the fictional force on the couch? 2) what is the magnitude and direction of the net force on the couch? 3) what is the magnitude and direction of the acceleration of the couch?arrow_forward2. You are moving the box (m=1Okg) across a rough floor by pushing on it at an angle of 20° below the horizontal with force of magnitude F=100N. What is the coefficient of kinetic friction between the box and the floor if it is moving at constant velocity? Present free-body diagram. 10°arrow_forward6. A horizontal pull force of 35 N is required to just start a 6 kg box moving across a horizontal concrete floor. a) Draw the free-body diagram of the box, showing all of the forces acting on the box. b) What is the coefficient of static friction,μs, between the box and floor? c) The 35 N pull force continues, but now that the box is moving, it accelerates at constant a = 0.6 m/s². What is the coefficient of kinetic friction,μk?arrow_forward
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