A boy performs 100 J of work pushing a chair a distance of 4 m. How much

force does the boy use? Assume there is no friction.

25 N

Explanation:

Force can be found using the following formula.

F=w/d

where w is the work and d is the distance. We know that 100 Joules of work pushes the chair 4 meters. Therefore,

w=100 J

d = 4 m

F=100 J / 4 m

Divide 100 by 4

100/4=25

F = 25 J/m

1 joule per meter, or J/m is equal to 1 Newton, or N.

F=25 N

The boy uses 25 Newtons of force.