Physics Laboratory Manual
4th Edition
ISBN: 9781133950639
Author: David Loyd
Publisher: Cengage Learning
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Chapter 7A, Problem 8PLA
For either type of coefficient of friction, what is generally assumed about the dependence of the value of the coefficient on the area of contact between the two surfaces?
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If an angle is 0.9 degrees calculate the value the coefficient of friction
A block of mass 4.20 kg is pushed up against a wall by a force P that makes an angle of θ = 50.0°angle with the horizontal as shown below. The coefficient of static friction between the block and the wall is 0.270.
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Chapter 7A Solutions
Physics Laboratory Manual
Ch. 7A - Prob. 1PLACh. 7A - Static friction is (a) always less than the...Ch. 7A - The two coefficients of friction discussed in this...Ch. 7A - Suppose a block of mass 25.0 kg rests on a...Ch. 7A - For the laboratory measurement of the static...Ch. 7A - Prob. 6PLACh. 7A - Prob. 7PLACh. 7A - For either type of coefficient of friction, what...
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- A tool box of weighing 50.0 N rests on a horizontal surface. The coefficient of static friction between the box and the surface is 0.40, and the coefficient of kinetic friction is 0.20. If no horizontal force is applied to the box and the box is at rest, how large is the friction force exerted on the box?arrow_forwardIf a box on a horizontal surface has an externally applied horizontal force less than the maximum static frictional force, the box has a motion relative to the surface equal to?arrow_forwardIf a box on a horizontal surface has an externally applied horizontal force that exceeds the value of the static frictional force, the box is defined to be.arrow_forward
- In about 1915, Henry Sincosky of Philadelphia suspended himself from a rafter by gripping the rafter with the thumb of each hand on one side and the fingers on the opposite side. Sincosky’s mass was 79 kg. If the coefficient of static friction between hand and rafter was 0.70, what was the least magnitude of the normal force on the rafter from each thumb or opposite fingers? (After suspending himself, Sincosky chinned himself on the rafter and then moved hand-over-hand along the rafter. If you do not think Sincosky’s grip was remarkable, try to repeat his stunt.)arrow_forwardThe coefficient of kinetic friction between a box and the floor is μk = 0.14 and the coefficient of static friction is μs = 2.0μk. Calculate the ratio of static to kinetic friction force if m = 8 kg.arrow_forwardFind the height upto which an insect can crawl up a fixed hemispherical bowl of radius r , the coefficient of friction=(1/3).arrow_forward
- A woman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. The book has a mass of m = 1.7 kg and the coefficient of static friction between her hand and the book is μs = 0.59. Force minimum?arrow_forwardA child wants to pull a wagon with a mass of 5.0 kg up a hill, the slope of which forms an angle of 8° with respect to the horizontal. If the child is on the slope, with the trolley stationary, what is the coefficient of static friction?arrow_forwardA 10 kg block sits on a horizontal surface and is pushed parallel to that surface. The coefficients of static and kinetic friction are 0.2 and 0.1, respectively. How much force is required to get the block moving?arrow_forward
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