Question

Calculate the work done by a 47N force pushing a 0.025kg pencil 0.25 m against a force of 23N​

Answer 1

Total force applied =47N

Assuming that direction of movement of pencil and applied force is same.

Work done by force in moving the pencil

Work done = force × displacement

= 47×0.25

= 11.75J

In case we are asked useful work done then we calculate net force used for pushing the pencil:

Net force used for pushing the pencil

=47-43

=24N

Assuming that direction of movement of pencil and net force is same.

Useful Work done by force in moving the pencil

W' = force × distance

= 24×0.25

= 6 J (answer)

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