Work: Calculating Work done by Forces

3 ingredients for work to be done:

• Force, Displacement, Energy

• Displacement, Momentum, Cause

• Force, Mass, Acceleration

• Force, Displacement, and Cause

In which example is work being done?

• A weightlifter holds 300 pound weights above her head.

• A student carries a stack of books from one side of the room to the other at a constant speed.

• A box slides over a frictionless surface at a constant speed.

• A box is in free fall.

A Tension Force pulls a 10 kg object 10 m directly up at a constant speed. What is the magnitude of the force?

• 10 N

• 98 N

• 100 N

• 980 N

A Tension Force pulls a 10 kg object 10 m directly up at a constant speed. How much work is done by the force?

• 10 J

• 98 J

• 100 J

• 980 J

A 2.0 N Force is applied to a 0.5 kg crate to move it to the right 4 m at a constant speed as seen in the diagram. What is theta?

A 2.0 N Force is applied to a 0.5 kg crate to move it to the right 4 m at a constant speed as seen in the diagram. What is the amount of work done by the force?

• 4 J

• 1 J

• 2 J

• 7 J