College Physics Volume 2
2nd Edition
ISBN: 9781319115111
Author: Roger Freedman, Todd Ruskell, Philip R. Kesten, David L. Tauck
Publisher: W. H. Freeman
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Chapter 5, Problem 1QAP
To determine
Complete the sentence by choosing the correct word.
Expert Solution & Answer
Answer to Problem 1QAP
The static frictional force between two surfaces is sometimes less than the normal force.
Explanation of Solution
Introduction:
Friction is defined as the force that resists the sliding of one object past another. Static friction (fs) is the force that is preventing sliding. This static friction can be overcome by pushing the object with sufficient force. This is called the maximum static friction, fs,max. The value of fs,maxdepends on the normal force, n; that acts perpendicular to the two surfaces and on the properties of the surface in contact.
Here μsis the coefficient of static friction which depends on the properties of both surfaces in contact.
Typical values for the coefficient of static friction are less than one. But there are some exceptions in which the coefficient of friction has a value higher than one. Therefore, according to above equation, when μsis less than one, static friction is less than the normal force. And when μsis higher than one, static friction is larger than the normal force.
Conclusion:
The static frictional force between two surfaces is sometimes less than the normal force.
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Students have asked these similar questions
Explain the importance of friction force in everyday life by citing at least threesituations.
A horse is harnessed to a sled having a mass of 236 kg, including supplies. The horse must exert a force exceeding 1 240 N at an angle of 35.0o in order to get the sled moving. Treat the sled as a point particle, (a) Calculate the normal force is 1 240 N. (b) and the coefficient of static friction between sled and the ground beneath it. (c) Find the static frirction force when the horse is exerting a
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Chapter 5 Solutions
College Physics Volume 2
Ch. 5 - Prob. 1QAPCh. 5 - Prob. 2QAPCh. 5 - Prob. 3QAPCh. 5 - Prob. 4QAPCh. 5 - Prob. 5QAPCh. 5 - Prob. 6QAPCh. 5 - Prob. 7QAPCh. 5 - Prob. 8QAPCh. 5 - Prob. 9QAPCh. 5 - Prob. 10QAP
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- When you learn to drive, you discover that you need to up slightly on the brake pedal as you come to a stop or the car will stop with a jerk. Explain this in terms of the relationship between static and friction.arrow_forwardThe mayor of a city reprimands some city employees because they will not remove the obvious sags from the cables that support the city traffic lights. What explanation can the employees give? How do you think the case will be settled in mediation?arrow_forwardA horse is harnessed to a sled having a mass of 236 kg, including supplies. The horse must exert a force exceeding 1 240 N at an angle of 35.0 in order to get the sled moving. Treat the sled as a point particle, (a) Calculate the normal force on the sled when the magnitude of the applied force is 1 240 N. (b) Find the coefficient of static friction between the sled and the ground beneath it. (c) Find the static friction force when the horse is exerting a force of 6.20 102 N on the sled at the same angle.arrow_forward
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