When is friction desirable?
A.Writing on a paper
B.Putting extra effort when walking
C.Reducing the serviceable life of the machine
D.Exerting a lot of effort to move the block on a rough surface
A.Writing on a paper
B.Putting extra effort when walking
C.Reducing the serviceable life of the machine
D.Exerting a lot of effort to move the block on a rough surface
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Answer:
A.Writing on a paper
Explanation:
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