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This test consists of 5 multiple choice questions, 5 short answer questions, and 10 short essay questions.

Multiple Choice Questions

1. What is one example the author uses of a wedge?
(a) A ship's ramp.
(b) A type of door stop.
(c) An escalator.
(d) A block and tackle system.

2. What is a first-class lever?
(a) Where the effort is a greater distance from the fulcrum than the load.
(b) Where the effort and the load are equal distances from the fulcrum.
(c) Where the distance is further from the fulcrum than the effort.
(d) Where there is no load needed for the effort.

3. What are small propellers mounted in the base of a ship's hull?
(a) Tillers.
(b) Thrusters.
(c) Rudders.
(d) Stablizers.

4. What is the principle that states energy is neither created nor destroyed?
(a) The principle of the conservation of energy.
(b) The principle of energy gain.
(c) The principle of energy change.
(d) The principle of energy loss.

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

Short Answer Questions

1. How does a rocket engine power the craft?

2. What is suction referred to in the act of flying?

3. How many ways can heat travel?

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

5. What is an absence of substance?

Short Essay Questions

1. How do the rotor blades on a helicopter work?

2. What is a vacuum? What is one invention that uses this principle?

3. How does a zipper work?

4. How is nuclear power generated? What is one naturally occurring nuclear fusion?

5. What is the most common form of inclined plane in machines? How does it work?

6. Discuss the relation of effort to distance.

7. Discuss the concept of floating.

8. What determines if an object will float?

9. Discuss how sails are used on a boat.

10. How does a ship use plimsoll lines?

(see the answer keys)

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