Penguin on a sled
A sled weighing 60.0 N is pulled horizontally across snow so that the coefficient of kinetic friction between sled and snow is .100. A penguin weighing 70.0 N rides on the sled. If the coefficient of static friction between penguin and sled is .700, what is the maximum horizontal force that can be exerted on the sled before the penguin begins to slide off?
Answer
The general approach to these problems are the following steps:
1. Set up a diagram of all the forces which are possible. In this case there are 2 forces of friction and the force of gravity.
2. Balance the forces out using Newton's second law, except find it for when acceleration is zero since that is the limit where there would be a change and there would be an unbalance of forces. (Include the force which is caused by the pulling motion)
3. Lastly, don't forget to solve for the extra F which should be included to account for the force that is causing the pulling motion.
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The general approach to these problems are the following steps:
1. Set up a diagram of all the forces which are possible. In this case there are 2 forces of friction and the force of gravity.
2. Balance the forces out using Newton's second law, except find it for when acceleration is zero since that is the limit where there would be a change and there would be an unbalance of forces. (Include the force which is caused by the pulling motion)
3. Lastly, don't forget to solve for the extra F which should be included to account for the force that is causing the pulling motion.