Static and Kinetic Friction Purpose In this lab, you will make some basic measur

Question

Static and Kinetic Friction Purpose In this lab, you will make some basic measurements of friction. You will measure the coefficients of statie and kinetic friction using a horizontal and an inclined plane. Theory The coefficient of static friction p, can be measured experimentally for an object placed on an inclined plane (a.k.a. ramp, a.k.a. hill). The coefficient of static friction is related to the critical angle & for the ramp, at which the object just begins to slide. Using what we have covered in class, you can derive this relationship yourself At this critical angle, static friction preventing the object from sliding down the hill is just exactly equal to the component of the object's weight along the hill. If the component of the weight along the hill were just a little greater, it would overcome friction, and the object would start to slide down. The free body diagram for this situation will look like the figure sketched below. Use this diagram to find an equation that relates , to e. Fs- Normal Force- mg cos(0) Fo- mg sin(0) Y- Fe my mg tose #1: the angle ? of the incline is the same as the angle between the normal force N and the ht mg. Why?

Explanation / Answer

a) The value of the coefficient of static friction is greater than the value of kinetic friction.

b) Normally one would expect the coefficient of kinetic friction to greater than the static one but in practice, it is not.

c) source of error could be the acceleration in the box ie applying the force sufficient enough to overcome force when calculating the coefficient of static friction.

d)yes it can be greater than 1. A coefficient greater than 1 means the frictional force is greater than normal force.

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