Home work 2

Home work 2 - Home Work#2 Exercises 8 It's much easier to...

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Home Work #2 Exercises 8. It’s much easier to carry a weight in your hand when your arm is at your side than it is when your arm is pointing straight out in front of you. Use the concept of torque to explain this effect. When the arm is pointing straight out in front of you any sort of weight on your hand is at a right angles with the arm and this in turn produces a large amount of torque on your sholder. When your am is at your side any weight is directed the opposite way of the shoulder and produces no torque on it what so ever. 28. If you are pulling a sled along a level field at constant velocity, how does the force you are exerting on the sled compare to the force of sliding friction on its runners? By pulling the sled at a constant velocity, the forward force being exerted on the sled must balance the backward force that friction is exerting on the sled. 32. Falling into a leaf pile is much more comfortable than falling onto the bare ground. In both cases you come to a complete stop, so why does the leaf pile feel so much better?
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