Asked Dec 19, 2019

Why does the force of gravity does no work on a car that rolls down a hill but no work when it rolls along a level part of the road?


Expert Answer

Step 1

Actually there is a small mistake in the given question. The question is the force of gravity does work on a car that rolls down a hill but no work when it rolls along a level part of the road.

Step 2

The work done by the car is


Image Transcriptionclose

W = F·d = Fd cose = mg cos e F is the force, d is the displacement, O is the angle between the force and the displacement

Step 3

As the car rolls down a hill, the angle between the direction of the force and the displacement i...

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