Physocs I- Experiment IV - PRE-LAB QUESTIONS 1 Explain...

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PRE-LAB QUESTIONS 1 Explain briefly the different types of frictional forces.
2 How does the coefficient of friction depend upon the area of contact? Explain.
3 Give some examples in which the force of friction causes the object to accelerate.
4 If you push on a heavy box that is at rest, you must exert some force to start its motion.
5 However, once the box is in motion you need a smaller force to maintain that motion. Why?
Because once the box is in motion, we just need only a smaller force to win the kinetic friction ( F k = µ k N) to maintain that motion. Usually for most material µ s k , static friction is usually bigger than kinetic friction.

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