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

2. What is an example of a second-class lever?
(a) An engine block system.
(b) A clock.
(c) A crane.
(d) A nutcracker.

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

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

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

Short Answer Questions

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

2. What does one have to understand in order to understand the way things work?

3. What is applied to a lever to make it move?

4. In flying, what is used to overcome weight from gravity?

5. What happens when an object is placed in water?

(see the answer key)

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