Friction is very useful in our daily lives, but it can also cause problems. Which of the following is a clear disadvantage or harmful effect of friction?

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A The soles of our running shoes wearing out and becoming smooth over time
B Being able to write with a pencil
C A car stopping safely when the brakes are hit
D None of the above

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Answer: A. The soles of our running shoes wearing out and becoming smooth over time

Constant rubbing causes surfaces to wear down and tear, which is a major disadvantage of friction.

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Friction is very useful in our daily lives, but it can also cause problems. Which of the following is a clear disadvantage or harmful effect of friction?

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