7. How can you best reduce friction between the bottom or feet of furniture and the floor
A. by smoothing the floor
B. by keeping furniture on their place
C. by applying lubricants like wax on the floor
D. by putting wheels or rollers on the bottom or feet of furniture
8. Why are oil and lubricants applied to machine parts?
1. To make the parts move easily
Il. To prevent the parts to move fast
III. To protect the parts from wearing down
IV. To make the parts move slowly
A. I and II
C. ll and Ill
B. I and III
D. Ill and IV
9. Which shows that friction is undesirable?
A. pushing furniture
B. lighting a matchstick
C. walking on wet floors
D. using the breaks when approaching a stoplight
10. Which shows that more friction is useful?
A. Wheels of cars have jagged surface.
B. Bowling lane is smooth.
C. Heavy appliances have rollers.
D. Slides have smooth surface.
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Verified answer
Answer:
7.B
8.B
9.C
10.A
Explanation:
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