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

  1. 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 ???
     
  2. jcsd
  3. Re: gravity

    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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