Example 5.13 Friction in horizontal motionYou want to move a 500-N crate across a level floor. To start thecrate moving, you have to pull with a 230-N horizontal force.Once the crate "breaks loose" and starts to move, you can keep itmoving at constant velocity with only 200 N. What are the coeffi-cients of static and kinetic friction?Example 5.15 Minimizing kinetic frictionIn Example 5.13, suppose you meve the crate by pulling upwardon the rope at an angle of 30° above the horizontal. How hard mustyou pull to keep it moving with constant velocity? Assume thatMk = 0.40.Example 5.16 Toboggan ride with friction ILet's go back to the toboggan we studied in Example 5.10. Thewax has worn off, so there is now a nonzero coefficient of kineticfriction uk. The slope has just the right angle to make the tobogganslide with constant velocity. Find this angle in terms of w and HkExample 5.17 Toboggan ride with friction IIThe same toboggan with the same coefficient of friction as inExample 5.16 accelerates down a steeper hill. Derive an expres-sion for the acceleration in terms of g, a, uk, and w.

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You want to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230-N horizontal force. Once the crate "breaks loose" and starts to move, you can keep it moving at constant velocity with only 200 N. What are the coeffi- cients of static and kinetic friction? Example 5.15 Minimizing kinetic friction In Example 5.13, suppose you move the crate by pulling upward on the rope at an angle of 30° above the horizontal. How hard must you pull to keep it moving with constant velocity? Assume that 0.40.

You want to move a 500-N crate across a level floor. To start the crate moving, you have to pull with a 230-N horizontal force. Once the crate "breaks loose" and starts to move, you can keep it moving at constant velocity with only 200 N. What are the coeffi- cients of static and kinetic friction? Example 5.15 Minimizing kinetic friction In Example 5.13, suppose you move the crate by pulling upward on the rope at an angle of 30° above the horizontal. How hard must you pull to keep it moving with constant velocity? Assume that 0.40.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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