Home Page of Peggy E. Schweiger
Work Sample Problems
- A 1200 N force is applied parallel to a horizontal surface. It pushes an 80 N box 2 m across the surface.
What work is done? What power is dissipated in 3 minutes?
- Now the force is applied at a 30° angle relative to the horizontal. What is the force
that does work on the box? What work is done? What power is dissipated 5 minutes?
- A 500 N weight is pushed up an incline that is 4 m long and 1.2 m high. A 200 N force is applied to push the weight, taking 5 minutes. What is the work output? Work input? IMA? MA? Efficiency? Power dissipated? What work is done to overcome friction?
- A set of pulleys lift a 1200 N load. A 200 N force is applied over an unknown distance. The pulleys are lifted 2 m. If the pulleys are 80% efficient, what distance is the 200 N force applied over? What work is done to overcome friction?
Energy Sample Problems