PHYSICS Force calculations. 2

# PHYSICS Force calculations. 2 - P HYS ICS FORCE CALCU LAT...

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PHYSICS: FORCE CALCULATIONS. 1. A dock worker loading crates on a ship finds that a 19 kg crate, initially at rest on a horizontal surface requires 74N horizontal force to set it in motion. However, after the crate is in motion, a horizontal force of 56N is required to keep it moving with constant speed. Find the coefficient of static friction, and Kinetic friction between the crate and the floor. Coeffcient of static friction μ = 74 N / ( 19 * 9.8) = 0.397 Coeffcient of kinetic friction μ ' = 56 N / ( 19 *9.8 ) = 0.300 2. In a pulley system with m1 sitting on a horizontal surface and m2 hanging down on a string from the pulley, m1 = 11.0 kg, and m2 = 4.0 kg, the coefficient of static friction between m1 and the horizontal surface is 0.6, while the coefficient of kinetic friction is 0.3. A) If the system is released, from rest, what will its acceleration be? B) If the system is set in motion with m2 moving downward, what will be the acceleration of the system? m1 = 10.0 kg and m2 = 4.0 kg. The coefficient of static friction between m1 and the horizontal surface is 0.50 while the coefficient of kinetic friction is 0.30.

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