4. Derive an expression for gravitational potential
energy for an object.
5. Can any object have mechanical energy even if its
momentum is zero ? Explain.
6. Can any object have momentum even if its
mechanical energy is zero ? Explain.
7. Why does a saw become warm when it is used to
cut a wooden log? State the energy transformation.
8. A stone is dropped from a height 'h'. Prove that the
energy at any point in its path is 'mgh'.
9. Derive a relationship between linear momentum and kinetic energy.
10. A light and a heavy object have the same momentum. Find out their ratio of kinetic energy. Which one has larger kinetic energy.
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Answer:
10 questions for only five points .....
I can't solve them....
really sorry...
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