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2008
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October
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- QR: The force that gives back...
- LN: Potential function is well-defined for a conse...
- HW: Set #5
- HW: Set #4, RPM and Chandelier
- HW: Beware of Red Herrings
- HW: Hints for 5.70
- HW: Hints and Grading in MP
- QR: The log and the friction
- QR: The Sun doing any work on the Earth?
- NC: Scott Adams Quote (Dlibert)
- QR: Quiz Questions Revisited
- HW: Homework Grading Policy etc.
- EX: That Tarzan problem
- LN: Weight and apparent weight ...
- HW: New homework, new experiment
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October
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3 comments:
The frictional force should be greater than the weight multiplied by the coefficient of friction because in the figure, the truck has the chain pulling downward. The friction between the log and the ground is increased by the added normal force, creating stronger “bonds” between them. This makes the frictional force greater than the weight multiplied by the coefficient of friction.
Yes, that is right, Renald. The normal force between the road and the log increases to become more than the weight of the log if you press down on the log. Since the frictional force is mu * normal force, frictional force is greater than mu * weight. I give you the double credit bonus for that day's quiz for your good comments.
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