4.1.1 Frictional Force

Friction does not oppose motion. Friction opposes relative motion. In fact, when walking, we use friction both to initiate and stop motion.

One useful thing to know about friction is this: the friction between two surfaces increases if the two surfaces are pressed more strongly into each other.

Explanation at xmdemo.wordpress.com/115

When friction is multiplied thousands of times…

Explanation at xmdemo.wordpress.com/097

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