Identify the type of work done (positive/negative) in each case. Justify your
answer.
a). Work done by gravity on a ball thrown upwards.
b). Work done by frictional force on an object moving on a rough surface.
Answers
Answered by
2
a) positive
Explanation:
beacuse the garvitation acceleration
Answered by
1
Explanation:
a) the work done by the gravity is negative
of the change in the gravitational potential
energy . since the object rutern towards the original hight , h2-h1=0 and since the work done is zero . No work is done
Negative
b) frictional force is always opposing the relative motion of the body . when a body is dragged on the rough surface , the frictional force will be acting in the direction opposite to displiment . since the work done by frictional force will be negative.
Negative
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