154-wk-07b

# 154-wk-07b - HPHY 154 Workout 07b Applications of Newton's...

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HPHY 154 Workout 07b Applications of Newton’s Laws of Motion Prof. A. E. Bak Name 1. The coefficient of static friction between Teflon and scrambled eggs is about 0.04. What is the smallest angle from the horizontal that will cause the eggs to slide across the bottom of a tilted Teflon-coated skillet? 2. S&J Problem 5-36 (formerly S&B Problem 5-41). A 25.0- kg block is initially at rest on a horizontal surface. A horizontal force of 75.0 N is required to set the block in motion. After it is in motion, a horizontal force of 60.0 N is required to keep the block moving with constant speed. Find the coefficients of static and kinetic friction from this information. 3. A horizontal force of 12.0 N pushes a block weighing 5.00 N against a vertical wall. Between block and wall, the coefficients of static and kinetic friction are respectively 0.60 and 0.40. The block is not moving initially. Will the block start moving? 4. At some initial time, a 10- kg block sits on top of a 40- kg slab that rests on a frictionless horizontal surface. Between block and slab, the coefficients of static and kinetic friction are respectively 0.60 and 0.40. The block is now pulled with a horizontal force of 100 N. Find the respective accelerations of the block and slab. Additional Problems 5. A filing cabinet of weight 556 N rests on a level floor. Between cabinet and floor, the coefficients of static and kinetic friction are respectively 0.68 and 0.56. In four different attempts to move the cabinet, you push with horizontal forces of ! a " 222 N, ! b " 334 N, ! c " 445 N, and ! d " 556 N. For each attempt, determine if the cabinet moves and calculate the magnitude of friction that the floor exerts on it. The cabinet is initially at rest for each attempt. 6.

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## This note was uploaded on 06/03/2008 for the course PHYSICS 111 taught by Professor Stevens during the Spring '08 term at Morehouse.

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154-wk-07b - HPHY 154 Workout 07b Applications of Newton's...

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