The moment, a force retards the motion of a body, what is the nature of work done by the force?
Give reason and list any 2 ex of such situation.
Give reason and list any 2 ex of such situation.
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Examples of negative work done are ;
1. Work done by the person to draw water from the well through pully.
2. Work done by frictional force.
3. Work done by gravitational Force when the object is thrown upward.
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here the angle between the direction of force and the displacement is 180°
So A = 180 ; cos A = -1
work done(W) = F S cos A = -FS
therefore
work done is negative
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EXAMPLES
1)a ball thrown upwards against the force of gravity.
2)walking on the ground . when a person walks on the ground he is doing negative work against the force of friction.