Which 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 increases

Which 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 increases

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Description: Which 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 magn

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter5: Newton's Laws Of Motion

Section: Chapter Questions

Problem 5PQ

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In 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.
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.
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Mazie stands on her kitchen floor. The coefficient of kinetic friction between her socks and the floor is 0.35, and the coefficient of static friction is 0.42. She has a mass of 58 kg. b. Mazie slides across the floor at a speed of 1.3 m/s. What is the force of kinetic friction acting on her? c. Mazie climbs up on the roof of her house, which has an angle of 25°. The coefficient of static friction between her and the roof is 0.35. Will she slip off the roof? Explain your answer. d. Given that μ s = 0.35, what is the maximum angle the roof could have without her slipping?
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Part A An object moves in a circular path at a constant speed. What is the relationship between the directions of the object's velocity and acceleration vectors? The velocity vector points toward the center of the circular path. The acceleration is zero. The velocity and acceleration vectors are perpendicular. The velocity and acceleration vectors point in opposite directions. The velocity and acceleration vectors point in the same direction. The velocity vector points in a direction tangent to the circular path. The acceleration is zero. Submit Request Answer
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A desperate hiker has to think fast to help his friend who has fallen below him. Quickly, he ties a rope to a rock of mass ma and makes his way over the ledge (see the figure). If the coefficient of maximum static friction between the rock and the ground is µ, and the mass of the hiker is mâ, what is the maximum mass of the friend, mc, that the rock can hold so the hikers can then make their way up over the ledge? Assume the rope is parallel to the ground and the point where the rope passes over the ledge is frictionless. mc = Ju
Review I Constants I P A car has a mass of 1500 kg. If the driver applies the brakes while on a gravel road, the maximum friction force that the tires can provide without skidding is about 7000 N. Part A If the car is moving at 26 m/s, what is the shortest distance in which the car can stop safely? Express your answer to two significant figures and Include the approprlate units. HA Az = Value Units Submit Previous Answers Request Answer X Incorrect; Try Again; 2 attempts remaining Provide Feedback FEB 13 J O stvN
A calculator is set on top of a book and the book is then pushed so that it slowly accelerates across a desk, taking the calculator with it. The person pushing the book does not touch the calculator. What type of force causes the calculator to accelerate? The calculator is accelerated by a static friction force caused by the book. O The calculator is accelerated by a kinetic friction force caused by the book. O The calculator is accelerated by a kinetic friction force applied by the person's hand. O The calculator is accelerated by a static friction force applied by the person's hand.