Question

1. A force of 10N causes a displacement of 2m in a body in its own direction. Calculate the work done by force.
2.How much force is applied on the body when 150 joule of work is done in displacing the body through a distance of 10m in the direction of force

Answer 1

1)

Case 1


Given Force = 10 N
Displacement (if opposite to the direction of the applied force) = -2m
we know W = F×S
> 10×(-2)
> -20 J

Case 2

If the displacement is in the direction off the applied force -

Therefore, F = 10N
S= 2m
Therefore, we know,
W = F×S
= 10 × 2 = 20J (ans)



2) Given Work = 150J
Displacement = 10 m
We know F= W/S
= 150/10=5N(ans)