Question

What is the role of a friction if it is there, in the following situations:
We are just standing on the floor without moving and we are walking.​

Answer 1

Answer:

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Answer 2

Answer:

Friction is a force that opposes motion between any surfaces that are touching. Friction can work for or against us. For example, putting sand on an icy sidewalk increases friction so you are less likely to slip. On the other hand, too much friction between moving parts in a car engine can cause the parts to wear out. Other examples of friction are illustrated in the two Figures below

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