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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 does increasing heat do to molecules?
(a) Nothing.
(b) It slows them down.
(c) It makes them break apart.
(d) It increases the movement of molecules.

2. What is an example of a second-class lever?
(a) A clock.
(b) An engine block system.
(c) A nutcracker.
(d) A crane.

3. What occurs when molecules begin vibrating in a solid, then speed up their vibration when heated?
(a) Conduction.
(b) Radiation.
(c) Internal combustion.
(d) Solid combustion.

4. What do machines that keep something cool do to heat?
(a) Remove it.
(b) Transpose it.
(c) Cause a change in velocity.
(d) Exchange it with cold material.

5. What causes expansion?
(a) Inertia.
(b) Gravity.
(c) Heat.
(d) Cold.

Short Answer Questions

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

2. What do compound levers contain?

3. What is a substance that contains only one type of atom?

4. What contains one element which is the detonator and another reactive element which acts as the propellant?

5. What is the transfer of heat through infrared rays?

Short Essay Questions

1. Discuss fulcrum points as pertaining to levers.

2. Discuss the relation of effort to distance.

3. What is an airfoil and how does it work?

4. How does the inclined plane require less strength for a task?

5. Discuss why the density of water varies.

6. How does a zipper work?

7. How does the atom bomb work?

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

9. Discuss the concept of floating.

10. Define the two elements that explosives must contain.

(see the answer keys)

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