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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 causes sideways movements of a ship?
(a) Cams.
(b) Jone's principle.
(c) Thrusters and stabilizers.
(d) Rods.

2. What is the effort you put in combined with the distance over which the effort is done?
(a) Mendal's law.
(b) Work.
(c) Rest.
(d) Gravity.

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

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

5. What is a substance that contains only one type of atom?
(a) A quantum.
(b) A cell.
(c) An element.
(d) A molecule.

Short Answer Questions

1. What do you have to use in order to accomplish work with half the effort?

2. How many types of gears are there?

3. What is the principle behind the action of any machine?

4. What happens if the force of upthrust is equal to the weight of an object in water?

5. What are tanks that take in water to increase the density of the craft?

(see the answer key)

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