Understanding the Concepts

* Work: Work is done when a force causes an object to move a certain distance. It's calculated as: *Work (W) = Force (F) x Distance (d)*

* No Friction: This means we don't need to consider any resistance to the chair's movement.

Solving for Force

1. We know:

* Work (W) = 100 J

* Distance (d) = 4 m

2. Rearrange the work equation to solve for Force:

* Force (F) = Work (W) / Distance (d)

3. Substitute the values:

* Force (F) = 100 J / 4 m

4. Calculate:

* Force (F) = 25 N

Therefore, the boy uses a force of 25 Newtons to push the chair.