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This quiz consists of 5 multiple choice and 5 short answer questions through Part 2, Harnassing the Elements, Exploiting Heat, Nuclear Power, pp. 142-173.

Multiple Choice Questions

1. What happens when you exert your strength across a longer distance?
(a) Your effort is reduced, and your lesser strength becomes sufficient.
(b) Your effort is reduced so you can take advantage of your greater strength.
(c) Nothing happens. It is all balanced by the decreased work required.
(d) Your effort is reduced, but your strength has to be increased.

2. What is the formula for work done?
(a) Effort multiplied by distance.
(b) Effort times gravitational force.
(c) Distance divided by strength.
(d) Distance plus effort.

3. What debris does a nuclear explosion create?
(a) Fallout.
(b) Steam.
(c) None.
(d) Acid rain.

4. What are the effects of electricity?
(a) Only light.
(b) Only magnetism.
(c) It depends on the amperage.
(d) Heat, light, and magnetism.

5. What is an example of a second-class lever?
(a) A crane.
(b) A nutcracker.
(c) An engine block system.
(d) A clock.

Short Answer Questions

1. What are tanks that take in water to increase the density of the craft?

2. How does a ship vary in density?

3. How does floating harness the power obtained by squeezing or stretching molecules?

4. What urges do molecules possess?

5. What is the density of salt water compared to fresh water?

(see the answer key)

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