Question

give some example where a force does work on a body but fails to change its Kinetic energy

Answer 1

An initially ice-skater pushes away from a railing and then slides over the ice. Her kinetic energy increases because of an external force

F

⃗ 

F→

on her from the rail . However, that force does not transfer energy from the rail to her. Thus,the force does no work on her.

Hope this may help you.........

Answer 2

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When a body is ppulled over a rough horizontal surface with a uniform velocity. Work is done ono the body by the applied force, but its KE remains unchanges.