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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 applied to a lever to make it move?
(a) Force.
(b) Gravitational pull.
(c) Balance.
(d) Work.

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

3. What controls direction on a ship?
(a) A valve.
(b) A rudder.
(c) A screw.
(d) A drive.

4. What is another type of wedge the author mentions?
(a) The gate latch.
(b) The sharp tapered edge of axes.
(c) The caliper.
(d) The inversion ring.

5. How does a zipper operate?
(a) The use of triangular wedges and lower curved wedges.
(b) Just using triangular wedges.
(c) Just lower curved wedges.
(d) It is not a wedge system, but rather a rolling arc system.

Short Answer Questions

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

2. What is the principle that states energy is neither created nor destroyed?

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

4. What is a first-class lever?

5. What is a wheel and rod attacked by a hinge?

(see the answer key)

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