Questions

1.

How much work would you have to do to lift a 10 kg object through a vertical distance of 2 m?

2.

By Newton's third law the object is also exerting a force on you as you lift it. How much work does it do on you during this process?

3.

What power would be exerted if you did this in 2 seconds?

4.

True or false: kinetic energy is always conserved?

5.

True or false: momentum conservation is a direct consequence of Newton's 2nd and 3rd laws of motion, so we don't expect it to be true for systems that do not obey Newton's laws exactly.