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) %3D 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/s'. 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 Hs 0.74 Steel on steel Aluminum on steel 0.57 0.61 0.47

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) %3D 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/s'. 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 Hs 0.74 Steel on steel Aluminum on steel 0.57 0.61 0.47

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College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!

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Friction
Saved to this PC
Jan
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Review
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Layout
、 A A Aa、 A m、而,行,俐刷烂T
AaBbCcDc AaBbCcDc AaBI AaBbC A
xA .A·
1 Normal
1 No Spac. THeading 1 1 Heading 2
Paragraph
Styles
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/s?.
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
Ms
0.74
Steel on steel
Aluminum on steel
0.57
0.61
0.47
DEL

Friction - Saved to this PC
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View
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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
Us
0.74
Steel on steel
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
Metal on metal (lubricated)
0.10
0.04
0.15
0.06
Ice on ice
0.1
0.03
Synovial joints in humans
Very rough surfaces
0.01
0.003
1.5

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