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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. How does a wedge move an object up an inclined plane?
(a) It uses the effect of gravity.
(b) It forces the object to reduce the effects of gravity.
(c) It doesn't ; the wedge moves the plane itself to raise an object.
(d) It lowers the plane so the object slides.

2. What is the formula for work done?
(a) Distance divided by strength.
(b) Effort times gravitational force.
(c) Effort multiplied by distance.
(d) Distance plus effort.

3. What is the effort you put in combined with the distance over which the effort is done?
(a) Work.
(b) Rest.
(c) Gravity.
(d) Mendal's law.

4. What happens if the force of upthrust is equal to the weight of an object in water?
(a) The object floats.
(b) The object moves across the surface of the water.
(c) The object sinks.
(d) The object projects out of the water.

5. What imparts movement into the air or water around them on a ship?
(a) Propellers.
(b) Bits.
(c) Levers.
(d) Cams.

Short Answer Questions

1. What controls the movement in a gear system?

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

3. How does a zipper operate?

4. 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?

5. The rack and pinion is an example of ______________.

(see the answer key)

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