A car (1000 kg) is going 20 m/s on a level road and slams on the brakes. The skid marks are 25m long. a) What is the change in kinetic energy during the skid? b) What is the work done on the car by the road? c) What is the work done on the car by gravity?

A car (1000 kg) is going 20 m/s on a level road and slams on the brakes. The skid marks are 25m long. a) What is the change in kinetic energy during the skid? b) What is the work done on the car by the road? c) What is the work done on the car by gravity?

College Physics

1st Edition

ISBN:9781938168000

Author:Paul Peter Urone, Roger Hinrichs

Publisher:Paul Peter Urone, Roger Hinrichs

Chapter7: Work, Energy, And Energy Resources

Section: Chapter Questions

Problem 7PE: A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N...

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Question

A car (1000 kg) is going 20 m/s on a level road and slams on the brakes. The skid marks are 25m long.

a) What is the change in kinetic energy during the skid?

b) What is the work done on the car by the road?

c) What is the work done on the car by gravity?

d) If the force of friction is constant over the 25m skid, what is magnitude of the force?

Definition Definition Force that opposes motion when the surface of one item rubs against the surface of another. The unit of force of friction is same as the unit of force.

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