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lecture13_1100_S12

# lecture13_1100_S12 - and the magnitude of the friction...

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I. Newton’s Second Law Examples Solving NSL Problems 1. Draw sketch 2. Draw FBD 3. Pick coordinate system 4. Break up forces into components 5. Set up NSL equation(s) 6. Solve for unknown(s) PHYS 1100 Spring 2012 Reading for Monday: Re-read 5.9

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GW1: A crate of mass m is pulled across a horizontal surface at a constant speed by a rope at an angle above the horizontal. How does the magnitude of the normal force acting on the crate compare to the crate’s weight? A. B. C. D. It cannot be determined N g F F N g F F = N g F F < PHYS 1100 Spring 2012
EX1: A force F pushes horizontally on a box of mass m that initially is at rest on a rough, horizontal surface. The coefficients of friction between the plane and the box are μ s=0.30 and μ k=0.28. If F =50 N and m =30 kg, what is the acceleration of the box

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Unformatted text preview: and the magnitude of the friction force? PHYS 1100 Spring 2012 GW2: A force F pushes on a box of mass m that initially is at rest on a rough, horizontal surface. The force F is directed at an angle θ =30° above the horizontal. The coefficients of friction between the plane and the box are μ s=0.30 and k=0.28. If F =50 N and m =15 kg, what is the acceleration of the box and the magnitude of the friction force? PHYS 1100 Spring 2012 EX2: A box of mass m rests on a plane inclined at an angle above the horizontal. If the coefficient of static friction between the plane and the box is μ s, what is the maximum angle the plane can be tilted if the box remains at rest? PHYS 1100 Spring 2012...
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