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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 is a wheel and rod attacked by a hinge?
(a) A worm.
(b) A crank.
(c) A spur.
(d) A prank.

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

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

4. How many types of gears are there?
(a) Five.
(b) Seven.
(c) Four.
(d) One.

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

Short Answer Questions

1. Upon what principle does a pulley work?

2. What happens when molecules are squeezed or stretched beyond the boundaries of their comfortable balance?

3. Why is cold water denser than warm water?

4. What is the resistance of an object to any change in its speed or direction?

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

(see the answer key)

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