COLLEGE PHYSICS
2nd Edition
ISBN: 9781464196393
Author: Freedman
Publisher: MAC HIGHER
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Chapter 5, Problem 9QAP
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Why is the minimum force required for moving bones in a typical knee joint different for different people, in spite of the fact that their joints have the same coefficient of friction
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An 85 kg man tries to pull himself up the face of a boulder using a rope hooked to a tree above it. The face of the boulder created a 50.0° angle with the horizontal. If the coefficient of friction between his shoes and the boulder is 0.350, will he make it up if he pulls with 550. N of force? Remember his shoes will try to slip backwards when considering friction.
(II) A 2.0-kg silverware drawer does not slide readily. The owner gradually pulls with more and more force, and when the applied force reaches 9.0 N, the drawer suddenly opens, throwing all the utensils to the floor. What is the coefficient of static friction between the drawer and the cabinet?
Is the coefficient of
static
friction
the same for two
surfaces regardless of the
normal force?
Why?
Chapter 5 Solutions
COLLEGE PHYSICS
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A mobile is formed by supporting four metal butterflies of equal mass m from a stringof length L. The points of support are evenly spaced a distance ℓ apart as shown inFigure P5.54. The string forms an angle θ1 with the ceiling at each endpoint. Thecenter section of string is horizontal. (a) Find the tension in each section of string interms of θ1, m, and g. (b) In terms of θ1, find the angle θ2that the sections of stringbetween the outside butterflies and the inside butterflies form with the horizontal. (c)Show that the distance D between the endpoints of the string isFigure P5.54arrow_forward(I) Suppose you are standing on a train accelerating at 0.20 g. What minimum coefficient of static friction must exist between your feet and the floor if you are not to slide?arrow_forwardWhere will friction be greater, when the plane is horizontal or tilted? Why?arrow_forward
- An 8 kg block rests on a horizontal surface whose coefficients of friction are: s = 0.4 and k = 0.2. The maximum force that can be applied to the block so that it does not move is?arrow_forwardDoes the mass of the object affect the angle at which the object “slips” at constant friction coefficient? Explain why or why not. What physical quantities are affected by the change in mass?arrow_forwardIf we know the direction of the normal force, then we know the direction of the frictional force. True or false? And why?arrow_forward
- In the early afternoon, a car is parked on a street that runs down a steep hill, at an angle of 35.0 relative to the horizontal. Just then the coefficient of static friction between the tires and the street surface is 0.725. Later, after nightfall, a sleet storm hits the area, and the coefficient decreases due to both the ice and a chemi- cal change in the road surface because of the temperature decrease. By what percentage must the coefficient decrease if the car is to be in danger of sliding down the street?arrow_forwardA coffee cup on the horizontal dashboard of a car slides forward when the driver decelerates from 45 km/h to rest in 3.5 s or less, but not if she decelerates in a longer time.What is the coefficient of static friction between the cup and the dash? Assume the road and the dashboard are level (horizontal).arrow_forwardDoes the fact that the coefficient given is the static friction coefficient changes anything or you can solve the problem the same way, regardless the coefficient is kinetic or static ? Thanks!arrow_forward
- (II) On an icy day, you worry about parking your car in your driveway, which has an incline of 12°. Your neighbor’s driveway has an incline of 9.0°, and the driveway across the street is at 6.0°. The coefficient of static friction between tire rubber and ice is 0.15. Which driveway(s) will be safe to park in?arrow_forwardIn 1991, a lobster with a mass of 25.0 kg was caught off the coastof Nova Scotia, Canada. Imagine this lobster involved in afriendly tug of war with several smaller lobsters on a horizontalplant at the bottom of the sea. Suppose the smaller lobsters areable to drag the large lobster a distance of 3.4 m reaching amaximum speed of 0.450 m/s. If the lobster is initially at rest,what is the magnitude of the net force applied to it by the smallerlobsters? Assume that friction and resistance due to movingthrough water are negligible.arrow_forwardA fluid‑like substance called synovial fluid lubricates the surfaces where bones meet in joints, making the coefficient of static friction between bones very small. For simplicity, assume the surfaces in the knee are flat and horizontal. Why is the minimum force required for initiating movement of bones in a typical knee joint different for different people, in spite of the fact that their joints have the same coefficient of static friction?arrow_forward
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