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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What is the cause of friction?
How do you calculate the friction coefficient of a surface with various areas of different frictions?
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?
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_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_forward
- Which statement about kinetic friction and static friction is true? The force of kinetic friction changes if the speed of the object decreases. The force of kinetic friction changes if the horizontal force (or forces) it opposes gets weaker. The force of static friction changes if the speed of the object decreases The force of static friction changes if the horizontal force (or forces) it opposes gets weaker.arrow_forwardWhich of the following is TRUE about the friction force between two surfaces? Mark only one. The surfaces must be in contact with each other in order to have friction. The surfaces must be moving against each other in order to have friction. O The magnitude of the friction force depends on the types of materials present, the force of contact between them, and the surface area of the objects. The magnitude of the friction force increases as the relative speed of the objects increasesarrow_forwardempt in Progress In 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 4.6 kg book is pushed from rest through a distance of 0.61 m by the horizontal 47N force from the broom and then has a speed of 1.4 m/s, what is the coefficient of kinetic friction between the book and floor? Number i Unitsarrow_forward
- Question 9arrow_forwardA 69 N ice skater is pushed across the ice in a skating rink by a friend. The coefficient of friction between the skater’s ice skates and the ice is 0.10. What force must the friend apply to push the skater at a constant speed across the rink?arrow_forwardBased on this value, what is the minimum coefficient of static friction μs between the race track and the bicycle?arrow_forward
- Give reasons for the answers to each of the following questions: (a) Clan a normal force be horizontal? (b) Can a normal force be directed vertically downward? (c) Consider a tennis ball in contact with a stationary floor and with nothing else. Can the normal force be different in magnitude from the gravitational force exerted on the ball? (d) Can the force exerted by the floor on the hall be different in magnitude from the force the ball exerts on the floor?arrow_forwardIn many textbook problems, we ignore certain complications such as friction and drag. The problems contain key words that indicate such a simplification is being used. For example, if a surface is described as slippery, it means that we can ignore friction. Look at the previous chapters problem sets. Find five uses of these key words and explain how to interpret each case.arrow_forwardLisa measured the coefficient of static friction between two pairs of running shoes and the track in Example 6.1 (page 159). If she wants to have an advantage in a race, which shoes should she wear, the ones with a high coefficient or the ones with the low coefficient of static friction? Explain.arrow_forward
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