Question

Why is a friction called a negative contact force ?​

Answer 1

Answer:

One being the cause and other being the effect. No, friction can not be termed as a negative acceleration, because it is a force which is produced by two bodies in contact. It is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.

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Answer 2

Answer:

The simplest answer is because it opposed the reality motion.

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