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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 principle behind the action of any machine?
(a) The conservation of energy.
(b) The amount of energy it saves.
(c) The amount of energy it expends.
(d) The type of energy it takes to make the machine work.

2. Where are wheels and axles found?
(a) On all pulley systems.
(b) Where a spoke and center come together.
(c) Wherever there is rotary motion.
(d) Just on cars and bikes.

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

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

5. 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.

Short Answer Questions

1. What is one component of a lever?

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

3. What urges do molecules possess?

4. What does the picture of a mammoth pulling a merry-go-round illustrate?

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

(see the answer key)

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