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This quiz consists of 5 multiple choice and 5 short answer questions through Part 2, Harnassing the Elements, Introduction, Floating, Flying and Pressure Power, pp.91-141.

Multiple Choice Questions

1. What does the inclined plane do?
(a) Extends the distance to a rise.
(b) Decreases gravitational force.
(c) Increases effort.
(d) Decreases effort.

2. What do you have to use in order to accomplish work with half the effort?
(a) Twice the distance.
(b) Ten percent of the distance multiplied by one-third of the effort.
(c) Half the distance.
(d) One-third the distance.

3. What is a fulcrum?
(a) A special sort of wedge.
(b) A pivot point.
(c) A formula for determining energy needed to do work.
(d) A point at which inertia is overcome.

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

5. What are tanks that take in water to increase the density of the craft?
(a) Variable.
(b) Bilge.
(c) Rolling.
(d) Ballast.

Short Answer Questions

1. What are small propellers mounted in the base of a ship's hull?

2. What is the main idea in Part 2 of the book?

3. What does the picture of a mammoth pulling a merry-go-round illustrate?

4. Upon how many major principles do propellers and rudders work?

5. What is the most common form of inclined plane found in machines?

(see the answer key)

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