Physics Laboratory Experiments
8th Edition
ISBN: 9781285738567
Author: Jerry D. Wilson, Cecilia A. Hernández-Hall
Publisher: Cengage Learning
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Textbook Question
Chapter 11, Problem 4ASA
What is the coefficient of friction, and in what units is it expressed? Distinguish between μs and μk. Which is generally greater?
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What is the coefficient of friction, and in what units it is expressed? Distinguish between u_s and u_k. Which is generally greater?
what are the units for the coefficients of kinetic and static friction? how does the coefficient of friction depend upon the area of contact?
Does friction always oppose motion (i.e., does it always act in the direction opposite to that of the moving object)? Does your answer change if it is static or kinetic friction? Describe a scenario for which static friction is responsible for forward motion? Use words, equations, diagrams, or all three to help you explain the physics.
Chapter 11 Solutions
Physics Laboratory Experiments
Ch. 11 - Prob. 1ASACh. 11 - What is the normal force, and why is it used...Ch. 11 - Why is it important to have the string parallel to...Ch. 11 - What is the coefficient of friction, and in what...Ch. 11 - Explain how graphs of weight versus normal force...Ch. 11 - Explain why fs sN; that is, why is fs less than...Ch. 11 - Speculate, in terms of the microscopic surface...Ch. 11 - (a) Prove that tan is equal to k when the block...Ch. 11 - Suppose that the block were made to move up the...
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- Kinetic friction is proportional to the normal force (Eq. 5.9). Why should there be an intimate connection between these two forces?arrow_forwardPhysics Review A construction cranes cable lifts a 50.0-kg box upward with an acceleration of 1.50 m/s2. Find the tension in the rope. (See Section 4.5.)arrow_forwardFriction The glue on a piece of tape can exert forces. Can these forces be a type of simple friction? Explain, considering especially that tape can stick to vertical walls and even to ceilings.arrow_forward
- A concept map is a visual representation of concepts and their connections. Create a concept map including the five specific forces listed in Table 5.1 and the four forces discussed in Section 5.10. Justify the placement of each force.arrow_forwardA mass of 3.2 kg is initially at rest upon a horizontal surface. An applied force of 42 N i then acts on the mass. If the coefficient of kinetic friction regarding the system is 0.868, what is the magnitude of the object's acceleration? Assume that all quantities are good to 3 significant figures, All numeric answers should be entered rounded to 3 significant figure.arrow_forwardWhat is the coefficient of static friction?arrow_forward
- Explain coefficient of friction, describing what different values of coefficient of friction correspond in terms of force of friction.arrow_forwardExplain the importance of friction force in everyday life by citing at least threesituations.arrow_forwardWhat is the coefficient of kinetic friction?arrow_forward
- he force diagram below shows a box accelerating to the right on a horizontal surface of negligible friction. The tension T is exerted at an angle of 30˚ above the horizontal. If μ is the coefficient of kinetic friction between the box and the surface, which of the following is a correct mathematical equation derived by applying Newton’s second law to the box? a a = (Tcos(θ) - μMg)/M b a = (Tsin(θ) - μMg)/M c a = (Tcos(θ) - μ(Mg - Tsin(θ))/M d a = (Tcos(θ) - μ(Mg + Tsin(θ))/Marrow_forwardYou need to move a 156 kg sofa to a different location in the room. It takes a force of 87 N to start it uniformly. What is the coefficient of static friction between the sofa and the carpet? **Keep answer as 3 places after the decimalarrow_forwardExplain how graphs of weight versus normal force give the coefficients of friction.arrow_forward
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