define work done against friction and work done against gravity with one example
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Work is done by specific forces not “against” forces. What is meant by “work done against” a force is “determine the work done by an exactly opposing force”.
example of this is
Kicking a football.
Moving a chair.
Throwing a stone.
Riding a bicycle.
Doctors moving a patient in wheel chair.
striking a pen into another pen.
Riding a skateboard.
Pushing and moving a table.
Work done by a body is against the applied force if the displacement is in a direction opposite to the force. In the case of gravity, if a body is lifted above the ground, work is done against gravity.
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