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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. How does a ship vary in density?
(a) According to the speed it is making.
(b) According to its load.
(c) According to how long it takes to get underway.
(d) According to how much water is on board.

2. In flying, what is used to overcome weight from gravity?
(a) Lift created by the nose.
(b) Lift created by the airfoil.
(c) Lift created by the tiller.
(d) Lift created by the rudder.

3. What do you have to use in order to accomplish work with half the effort?
(a) Ten percent of the distance multiplied by one-third of the effort.
(b) One-third the distance.
(c) Half the distance.
(d) Twice the distance.

4. Upon what does the amount of upthrust of an object in water depend?
(a) On what the water's electrical charge is.
(b) On whether or not the object is greater than one centimeter in diameter.
(c) On how much water the object displaces.
(d) On what the object's salinity is.

5. What controls the movement in a gear system?
(a) The size of the gear.
(b) The inertia needed to be overcome.
(c) The size of the belt.
(d) The rotation of the gear.

Short Answer Questions

1. What is another type of wedge the author mentions?

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

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

4. What do compound levers contain?

5. What additional tasks can a boat with two triangular sails do?

(see the answer key)

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