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When a ball rolls down an inclined plane , it gains speed because of

by alyafey22
Tags: ball, gains, inclined, plane, rolls, speed
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alyafey22
#1
Mar6-11, 09:16 PM
P: 21
When a ball rolls down an inclined plane , it gains speed because of gravity .When rolling up an inclined plane, it loses speed because of gravity .Why doesn't gravity play a role when it rolls on a horizontal surface ???
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aris1
#2
Mar7-11, 03:02 AM
P: 14
In an horizontal surface the force of the weight is perpendicular to the displacement so no work against gravity is done if that's what you mean 'gravity doesn't play a role'.
Only work against friction is done.


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