revwk4f09

# revwk4f09 - September 21 PHY 2048 Discussion Fall 09...

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September 21-September 22, 2009 PHY 2048 Discussion Fall ’09 Conceptual Review: Chapter 5 A . Newton’s Law 1. Two forces are exerted on an object. Can the acceleration of the object be zero? If yes, under what condition? 2. Two forces are exerted on a block of mass m. One of the forces F 1 is along +x direction. The block accelerates in the +y direction. a) Without any calculation, find which quadrant the 2 nd force is in? b) Express F 2 in unit-vector notation. 3. A block is on a horizontal surface. What are the reaction forces for the following forces: a) Normal force exerted on the block. b) Gravitational force acting on the block B. Some Particular Forces 1. A block is sliding down a frictionless slope of θ. Find the acceleration of the block and the normal force exerted on the block. 2. Under what condition you can assume the tensions at both ends are the same? 3. Two blocks are connected by a string with a negligible mass. The surface is frictionless. a) Choose a coordinate system for each block so that you can

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revwk4f09 - September 21 PHY 2048 Discussion Fall 09...

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