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3. How is brake useful?
A. It uses friction to make vehicles move faster.
B. It uses friction to slow down a moving vehicle.
C. It uses friction to move the vehicle to any direction.
D. It uses friction to move the vehicle easily.
4. Why are the oil and lubricants applied to machine parts?
I. To make the parts move easily
III. To protect the parts from wearing down
II. To prevent the parts move fast.
IV. To make the parts move slowly.
A. I, II
B. I, III
C. II, III D. III, IV
5. Which shows that more friction is useful?
A. Wheels of cars have jagged surface. C. Heavy appliances have rollers.
B. Bowling lane is smooth.
D. Slides have smooth surface.
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