COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 33QAP
To determine
The size of the coefficient of kinetic friction between a hockey puck and the ice of a rink
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Students have asked these similar questions
Estimate the height of a typical playground slide and theangle its surface makes with the horizontal. A child wearing a different sort of clothing than the first child climbs the ladder to the top of the slide, sits on the slide, lets go of the handrail, and remains at rest. What is the minimum possible value for the coefficient of static friction between this child and the surface of the slide?
Which of the following statements is true about friction?
k and us are independent on the mass of the object.
The coefficients of friction are independent on the nature of the surfaces.
Hk is greater than us
Static friction is relatively constant while kinetic friction is not.
The force of static friction depends on the area of contact between the two surfaces.
As a girl pushes an object across a wood floor, she suddenly comes to an
area where the floor has been waxed recently, making it slippery. What
becomes true of the coefficient of kinetic friction?
A. The coefficient of kinetic friction increases.
B. The coefficient of kinetic friction decreases.
C. The coefficient of kinetic friction becomes zero.
D. The coefficient of kinetic friction becomes negative.
Chapter 5 Solutions
COLLEGE PHYSICS
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- An automobile driver traveling down an 8% grade slams on his brakes and skids 30 m before hitting a parked car. A lawyer hires an expert who measures the coefficient of kinetic friction between the tires and road to be k = 0.45. Is the lawyer correct to accuse the driver of exceeding the 25-MPH speed limit? Explain.arrow_forwardA block lies motionless on a horizontal tabletop. You apply a force Fapp horizontally to the block, but it does not move. What can you say about the relative sizes and magnitudes of Fapp, the static friction force between the block and the table, and the kinetic friction force between the block and the table?arrow_forwardIn a pickup game of dorm shuffleboard, students crazed by final exams use a broom to propel a calculus book along the dorm hallway. If the 2.2 kg book is pushed from rest through a distance of 0.68 m by the horizontal 22 N force from the broom and then has a speed of 1.8 m/s, what is the coefficient of kinetic friction between the book and floor? Number i Unitsarrow_forward
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- The coefficient of kinetic friction is equal to the force of kinetic friction divided by Group of answer choices the normal force the weight of the object the mass of the object the acceleration of the object Why is static friction more complex in analysis than kinetic friction? Group of answer choices Because its magnitude and direction can vary Because it is invisible Because it does not depend on the normal force Because it depends on the kinetic friction Doc Physics says "I think that static friction should be seen as _________________." Group of answer choices What you have to do to get motion to happen What you have to do to get acceleration to happen What you have to do to get velocity to happen What you have to do every morning According to Doc Physics, what is the first thing you should do when solving dynamics problems? Group of answer choices Draw a FBD Choose your coordinate system Panic Apply Newton II What's wrong with Doc Physics's FBDs? Group of answer choices They…arrow_forwardphysics need help，how do we find kinetic friction coefficient in this question？arrow_forwardHow do you calculate the friction coefficient of a surface with various areas of different frictions?arrow_forward
- An automobile is going up a grade of 15 with an initial velocity of 30 m/s. The coefficient of static friction between the tires and the road is 0.7. a) What minimum distance does it take to stop the car? b) What minimum distance would it take to stop the car if it were going down the grade?arrow_forwardFlying Circus of Physics In the figure, a climber leans out against a vertical ice wall that has negligible friction. Distance a is 0.945 m and distance L is 1.95 m. His center of mass is distance d = 0.92 m from the feet-ground contact point. If he is on the verge of sliding, what is the coefficient of static friction between feet and ground? com —а — Hs = Number i Units %3Darrow_forwardFlying Circus of Physics Brake or turn? The figure depicts an overhead view of a car's path as the car travels toward a wall. Assume that the driver begins to brake the car when the distance to the wall is d=109 m, and take the car's mass as m=1430 kg, its initial speed as v0=39.0 m/s, and the coefficient of static friction as μS=0.500. Assume that the car's weight is distributed evenly on the four wheels, even during braking. (a) What magnitude of frictional force is needed (between tires and road) to stop the car just as it reaches the wall? (b) What is the maximum possible static friction fS, max? (c) If the coefficient of kinetic friction between the (sliding) tires and the road is μk=0.410, at what speed will the car hit the wall? To avoid the crash, a driver could elect to turn the car so that it just barely misses the wall, as shown in the figure. (d) What magnitude of frictional force would be required to keep the car in a circular path of radius d and at the given speed v0?…arrow_forward
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