1. What are two things a sail can do for a craft?
(a) Lift and Slow.
(b) Give pulpulsion and direction.
(c) Propel and repel.
(d) Propel and stop.

2. How many ways can heat travel?
(a) Four.
(b) Three.
(c) One.
(d) Two.

3. What happens when electrons are rubbed, shuffled, or brushed off one surface onto another?
(a) Homogenization.
(b) Hydrogenation.
(c) Static electricity.
(d) Homeostasis.

4. What do the double walls of a thermos enclose?
(a) Oxygen.
(b) Argon.
(c) Nitrogen.
(d) A vacuum.

5. How does heat travel through heating elements?
(a) Radiation.
(b) Conduction and convection.
(c) Through inertia.
(d) In groups of molecules.

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 is the result of a collision of molecules which break on impact forming new and different molecules?

3. What are the effects of electricity?

4. What is convection?

5. Towards which direction do electrons move on a magnet?

(see the answer key)

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