calculate the work done by a 47 N force acting a 0.0025 kg pencil 0.25 m against a force of 23 N.
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Total force applied
=
47
N
Assuming that direction of movement of pencil and applied force is same.
Work done by force in moving the pencil
W
=
Force
×
Distance through which force moves
⇒
W
=
47
×
0.25
=
11.75
J
.-.-.-.-.-.-.-.-.
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
−
23
=
24
N
Assuming that direction of movement of pencil and net force is same.
Useful Work done by force in moving the pencil
W
u
=
Force
×
Distance
⇒
W
u
=
24
×
0.25
=
6
J
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