Which of the following is NOT an example of friction as a helpful force? A. Using your hand to wave hello to a friend

B. Using a cloth to clean a pair of glasses

C. Using a marker to draw a picture on paper

Using your hand to wave hello to a friend

Explanation:

The other two are helpful friction scenarios  while A. isn't applicable.

Hope it helps :) !!!

A.

Explanation:

By waving your hand you do not rub against anything else therefore friction is not possible.

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