Question

1.Why is conservation of momentum often the best or only way to solve a puzzle?

-Because momentum is a vector and so it includes direction.

-momentum is a scalar so direction does not matter, only the initial and final values.

-momentum comes in many forms and so is flexible for solving many puzzles.

2. How does the work needed to get a car moving compare with its kinetic energy? (Ignore friction.)

		Less work is needed than the amount of energy.
		The work must be the same as the amount of energy.
		The work must be more than the amount of energy.

3.Keeping in mind the law of conservation of energy, what must be true about the universe?

		The universe will sooner or later run out of energy.
		We can always create more energy.
		We are using the same energy the first organisms used.

Answer 1

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