4. What is any engine that burns fuel inside the engine?
(a) Thermodynamic engine.
(b) Nuclear fusion engine.
(c) Steam engine.
(d) Internal combustion engine.

5. How does floating harness the power obtained by squeezing or stretching molecules?
(a) By energy "floating" through atomic fields and breaking the bonds to release energy.
(b) By squeezing an atom to split the proton and neutron.
(c) By gathering the individual electrons that are released.
(d) Through the form of upthrust.

6. 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.

7. What is electricity flowing through a wire?
(a) Ohms.
(b) Current.
(c) Watts.
(d) Resistance.

8. What does the Mechanics of Movement explore?
(a) How pulleys can create energy.
(b) How the movement of anything can be either a net gain or net loss of energy.
(c) How pulleys ultimately lose energy that can never be regained.
(d) How the conservation of energy plays into movement, force, and effort.

9. What is the factor which determines an object's ability to float?
(a) Volume.
(b) Density.
(c) Force.
(d) Inertia.

10. What does the inclined plane do?
(a) Increases effort.
(b) Extends the distance to a rise.
(c) Decreases gravitational force.
(d) Decreases effort.

11. How does a rocket engine power the craft?
(a) By nuclear fusion.
(b) By the turning of a propeller.
(c) By the combustion of one propellant.
(d) By the combustion of two propellants.

12. What forms a molecule?
(a) Five or more atoms.
(b) One or more atoms.
(c) Six or less atoms.
(d) Two or more atoms.

13. What debris does a nuclear explosion create?
(a) None.
(b) Acid rain.
(c) Fallout.
(d) Steam.

14. What is the most common form of inclined plane found in machines?
(a) The wedge.
(b) The rods.
(c) The rocker.
(d) The pully.

15. What is an absence of substance?
(a) A vacuum.
(b) Gravity.
(c) Matter.
(d) Outer space.

Short Answer Questions

1. What principle is in use as a propeller pushes the water back and as that same water which has been pushed back rolls forward again and hits the propeller?

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

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

4. What is a first-class lever?

5. Where is steam still used?

(see the answer keys)

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