The ramp the movers use to them move a refrigerator into the moving van modifies the force necessary to perform work and therefore is a(n)

Machine.

Explanation:

The ramp the movers use to help them move a refrigerator into the moving van modifies the force necessary to perform work and therefore is a machine. As it's in the definition of a machine that the the thing made by the people to make their work easier.

if they have a finite resultant