1. Which of the following shows beneficial effect of friction?
A. sliding on a slippery floor
B. Car running on a bumby road
C. Soles of shoes wore out because of friction
D. ice skaters can easily glide on the skate rink
2.One way to increase friction is to use_____.
A.Oil B.Sand C.Water D. Wax
3. What increase friction?
A. More surfaces area
B. Smooth surface
C. Rough surface
D. More speed
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Answer:
1.A
2.D
3.A
Explanation:
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