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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 do compound levers contain?
(a) A single fulcrum and two points of force and two of load.
(b) Two fulcrums and two points of force and two of load.
(c) Two fulcrums and one point of force and load.
(d) No fulcrum but two points of force and two of load.

2. What is a fulcrum?
(a) A pivot point.
(b) A special sort of wedge.
(c) A point at which inertia is overcome.
(d) A formula for determining energy needed to do work.

3. What is the main idea in Part 2 of the book?
(a) The way work can cause energy to dissipate.
(b) The way force can be exerted to change atomic structure.
(c) The way atoms can be made more dense.
(d) Exploring the bonds of attraction and the movement of molecules to and from each other.

4. What does a driving force initiate?
(a) Work.
(b) Inertia.
(c) Movement.
(d) Electron activity.

5. What does one have to understand in order to understand the way things work?
(a) The terms of physics.
(b) The underlying principle.
(c) The reason something is made.
(d) The function of something.

Short Answer Questions

1. How does a ship vary in density?

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

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

4. What causes sideways movements of a ship?

5. What are two things a sail can do for a craft?

(see the answer key)

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