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lecture14_1100_S12

# lecture14_1100_S12 - PHYS 1100 Spring 2012 Newtons Second...

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I. Newton’s Second Law Examples with Multiple Objects 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: 5.8

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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 μ 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
EX1: 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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EX1: 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 before the box begins to move? PHYS 1100 Spring 2012
CT1: Two blocks are connected by a massless string across a massless, frictionless pulley. The masses of the blocks are m 1 and m 2 with m 1 > m 2. When the blocks are released, which of the following scenarios are possible?

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lecture14_1100_S12 - PHYS 1100 Spring 2012 Newtons Second...

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