Question

Calculate the work you do in order to move a 61 kg crate a constant speed 5m along the floor against a friction force of 5 N.

Answer 1

Since the crate is moving at a constant speed, then the acceleration of the crate is 0. Then, the net force over the crate is also 0.

You need to exert a force of 5 N to counteract the friction force.

The work done after applying a force F along a distance d is given by the formula:

`W=F* d`

Remember that this formula is valid only if the force F and the displacement are parallel.

Substitute F=5N and d=5m to find the work:

`W=(5N)(5m)=25N\cdot m=25J`

Therefore, the work that you do in such situation, is:

`25J`