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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) Two or more atoms.
(c) Six or less atoms.
(d) One or more atoms.

2. Upon what principle does a pulley work?
(a) It is easier to pull something down rather than up.
(b) The amount of work required is halved by the amount of effort.
(c) The rotation of one gear pulls the other.
(d) It is easier to overcome gravity than force.

3. How does a wedge move an object up an inclined plane?
(a) It forces the object to reduce the effects of gravity.
(b) It doesn't ; the wedge moves the plane itself to raise an object.
(c) It lowers the plane so the object slides.
(d) It uses the effect of gravity.

4. Upon how many major principles do propellers and rudders work?
(a) Three.
(b) Four.
(c) One.
(d) Two.

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

Short Answer Questions

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

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

3. What happens if the edges of the two wheels touch?

4. What is suction referred to in the act of flying?

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

(see the answer key)

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