revwk5f09 - September 28-September 29, 2009 PHY 2048...

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September 28-September 29, 2009 PHY 2048 Discussion Fall ’09 Conceptual Review: Chapter 6 A . Friction 1. Find the magnitude and direction of the friction on a block on a horizontal surface in the following cases: a) The block is at rest and no external forces (except gravity and normal force) are excreted on it. b) A horizontal force F is exerted to the right but the block is still at rest. c) The block is on the verge of sliding to the right. d) The block is sliding to the left while a horizontal force F is exerted to the right. 2. A horizontal force F = 100 N is applied to a 5-kg crate on a 30º slope. The crate is initially at rest. Find the acceleration of the crate. μ s = 0.4 μ k = 0.2 B. Uniform Circular Motion 1. A particle of mass m is moving in a circle of radius R at a constant speed. If the period of the motion is T, what are the direction and magnitude of the force exerted on the particle? 2. A Ferris wheel of radius 10 m is rotating at a constant speed of 5 m/s. Find the force exerted on a 50-kg
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This note was uploaded on 01/15/2012 for the course PHY 2048 taught by Professor Field during the Fall '08 term at University of Florida.

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revwk5f09 - September 28-September 29, 2009 PHY 2048...

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