Question

Determine the approximate force (N) used to pull a sled up a 400 m hill using 1900 J of work.

0.2N

800,000N

500N

5N

Answer 1

The work done to pull the sled up to the hill is given by

`W=Fd`
where
F is the intensity of the force
d is the distance where the force is applied.

In our problem, the work done is
`W=1900 J` and the distance through which the force is applied is
`d=400 m`, so we can calculate the average force by re-arranging the previous equation and by using these data:

`F= (W)/(d)= (1900 J)/(400 m) = 4.75 N \sim 5 N`