2. The 30-kg crate is subjected to a force having a constant direction and a magnitude F = 150N. When s = 15m, the crate is moving to the right with a speed of 10 m/s. Determine its speed when s = 25m. The coefficient of kinetic friction between the crate and the ground is 0.25. F 30° Fig. 2. Problem 2

2. The 30-kg crate is subjected to a force having a constant direction and a magnitude F = 150N. When s = 15m, the crate is moving to the right with a speed of 10 m/s. Determine its speed when s = 25m. The coefficient of kinetic friction between the crate and the ground is 0.25. F 30° Fig. 2. Problem 2

International Edition---engineering Mechanics: Statics, 4th Edition

4th Edition

ISBN:9781305501607

Author:Andrew Pytel And Jaan Kiusalaas

Publisher:Andrew Pytel And Jaan Kiusalaas

Chapter7: Dry Friction

Section: Chapter Questions

Problem 7.71P: The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If...

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The 600-lb cable spool is placed on a frictionless spindle that has been driven into the ground. If the force required to start the spool rotating is F = 160 lb, determine the coefficient of friction between the ground and the spool. Neglect the diameter of the spindle compared to the diameter of the spool.
The coefficient of rolling resistance between the 30-kg lawn roller and the ground is r=0.1. (a) Determine the force P required to pull the roller at a constant speed. (b) What force P would be needed to push the roller at a constant speed?
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