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Questions for Thought
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1

How is work related to energy?
2

What is the relationship between the work done while moving a book to a higher bookshelf and the potential energy that the book has on the higher shelf?
3

Does a person standing motionless in the aisle of a moving bus have kinetic energy? Explain.
4

A lamp bulb is rated at 100 W. Why is a time factor not included in the rating?
5

Is a kWh a unit of work, energy, power, or more than one of these? Explain.
6

If energy cannot be destroyed, why do some people worry about the energy supplies?
7

A spring clamp exerts a force on a stack of papers it is holding together. Is the spring clamp doing work on the papers? Explain.
8

Why are petroleum, natural gas, and coal called fossil fuels?
9

From time to time, people claim to have invented a machine that will run forever without energy input and develops more energy than it uses (perpetual motion). Why would you have reason to question such a machine?
10

Define a joule. What is the difference between a joule of work and a joule of energy?
11

Compare the energy needed to raise a mass 10 m on Earth to the energy needed to raise the same mass 10 m on the Moon. Explain the difference, if any.
12

What happens to the kinetic energy of a falling book when the book hits the floor?







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