The static coefficient of friction is larger than the slidingcoefficient, becaus

Question

1. The static coefficient of friction is larger than the slidingcoefficient, because to get relative motion to occur, there must bea "little" shearing and smoothing of the micro–surfaces,which takes more energy (or work– a larger driving force).
   1. True
   2. False
2. The maximum friction force that can exist when there is notrelative motion is SN.
   1. True
   2. False
3. Friction forces always act so as to oppose the relative motion ofone surface to another.
   1. True
   2. False
4. A self–locking wedge is one that remains in place after thedriving force is removed.
   1. True
   2. False
5. A screw can be thought of as an inclined plane along which the load(force supported) can be moved.
   1. True
   2. False

Explanation / Answer

The static coefficient of friction is larger than the slidingcoefficient, because to get relative motion to occur, there must bea "little" shearing and smoothing of the micro–surfaces,which takes more energy (or work– a larger drivingforce). *can be proved false, but I bet your prof is looking for TRUE* The maximum friction force that can exist when there is notrelative motion is SN. *TRUE* Friction forces always act so as to oppose the relative motion ofone surface to another. *TRUE* A self–locking wedge is one that remains in place after thedriving force is removed. *TRUE* A screw can be thought of as an inclined plane along which the load(force supported) can be moved. *kinda unsure on this one, most likely FALSE, however all the resthave been true*

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