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Class 14 - Friction and Drag Physics 1301 Fall 2011 Class...

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1 Friction and Drag Physics 1301, Fall 2011: Class 14 Tuesday, October 4, 2011 Technology in the Middle East, Wednesday, 12:30, ME 1130, free food
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2 Objectives: Tuesday, October 4, 2011 Conservative and Non-Conservative Forces Friction Model for friction Model for Drag (air resistance)
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3 Demonstrations 1h10.10 Push me, pull me carts 1h10.12 Two scales 1h10.15 Reaction carts 1h10.20 Newton’s sailboat 1h10.90 Collision between carts
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Problem Elevator problem If an external force were pulling on the rope, the problem would be easy The answer must be different because the lady in the elevator is pulling on the rope 4
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Problem Elevator problem If an external force were pulling on the rope, the problem would be easy The answer must be different because the lady in the elevator is pulling on the rope 5 T mg T 2 T mg = ma a = 2 T m g
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Problem A massive steel cable drags a 20. kg block across a horizontal frictionless surface. A 100 N force applied to the end of the cable furthest from the block causes the block, initially at rest, to reach a speed of 4.0 m/s in 2.0 m. What force is applied to the block?
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