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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 forms a molecule?
(a) Five or more atoms.
(b) One or more atoms.
(c) Two or more atoms.
(d) Six or less atoms.

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

3. What is the resistance of an object to any change in its speed or direction?
(a) Lift.
(b) Propulsion.
(c) Inertia.
(d) Gravity.

4. What are large fins which adjust their tilt to compensate for waves?
(a) Screws.
(b) Stabilizers.
(c) Fans.
(d) Rotaries.

5. What is one example the author uses of a wedge?
(a) A block and tackle system.
(b) A ship's ramp.
(c) A type of door stop.
(d) An escalator.

Short Answer Questions

1. How many forces hold things together?

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

3. What is the principle behind the action of any machine?

4. What urges do molecules possess?

5. What does a driving force initiate?

(see the answer key)

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