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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. Why is cold water denser than warm water?
(a) Warm water has a greater ability to absorb force.
(b) Cold water's molecules move around more loosely.
(c) Warm water's molecules move around more loosely.
(d) Cold water has a greater ability to coalesce.

2. How many forces hold things together?
(a) One.
(b) Two.
(c) Four.
(d) Three.

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

4. What is the most common form of inclined plane found in machines?
(a) The wedge.
(b) The rods.
(c) The rocker.
(d) The pully.

5. What are different level marks for different types of water on the side of a ship called?
(a) Horizon marks.
(b) Anchor marks.
(c) Plimsoll lines.
(d) Flow marks.

Short Answer Questions

1. What is a first-class lever?

2. What is the formula for work done?

3. What are large fins which adjust their tilt to compensate for waves?

4. What imparts movement into the air or water around them on a ship?

5. What do compound levers contain?

(see the answer key)

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