Chapter 5. Magnitude of the static friction force (5-1)

Question

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{"title":"The magnitude of the force of static friction on an object","description":"Correct!","type":"correct","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"1,3,30,62\"},{\"shape\":\"rect\",\"coords\":\"23,7,24,11\"}]"} {"title":"....is less than or equal to a certain maximum value.","description":"Wrong","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"92,4,122,65\"}]"} {"title":"The maximum force of static friction depends on...","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"1,108,35,174\"}]"} {"title":"...the coefficient of static friction (which depends on the properties of the two surfaces in contact)","description":"Wrong","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"174,124,215,171\"}]"} {"title":"...and the normal force pressing the object against a surface.","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"228,124,259,156\"}]"}

Question

41w3UGMXfv+Eth/KHqjLSapSVy7CHbauWCxAabPyDIYZbYinPJSyAzKhGiiFHBNv3y7t+XumH0M=
{"title":"The magnitude of the force of static friction on an object","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"1,3,30,62\"},{\"shape\":\"rect\",\"coords\":\"23,7,24,11\"}]"} {"title":"....is less than or equal to a certain maximum value.","description":"Correct!","type":"correct","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"92,4,122,65\"}]"} {"title":"The maximum force of static friction depends on...","description":"Incorrect","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"1,108,35,174\"}]"} {"title":"...the coefficient of static friction (which depends on the properties of the two surfaces in contact)","description":"Wrong","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"174,124,215,171\"}]"} {"title":"...and the normal force pressing the object against a surface.","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"228,124,259,156\"}]"}

Question

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{"title":"The magnitude of the force of static friction on an object","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"1,3,30,62\"},{\"shape\":\"rect\",\"coords\":\"23,7,24,11\"}]"} {"title":"....is less than or equal to a certain maximum value.","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"92,4,122,65\"}]"} {"title":"The maximum force of static friction depends on...","description":"Correct!","type":"correct","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"1,108,35,174\"}]"} {"title":"...the coefficient of static friction (which depends on the properties of the two surfaces in contact)","description":"Wrong","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"174,124,215,171\"}]"} {"title":"...and the normal force pressing the object against a surface.","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"228,124,259,156\"}]"}

Question

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{"title":"The magnitude of the force of static friction on an object","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"1,3,30,62\"},{\"shape\":\"rect\",\"coords\":\"23,7,24,11\"}]"} {"title":"....is less than or equal to a certain maximum value.","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"92,4,122,65\"}]"} {"title":"The maximum force of static friction depends on...","description":"Wrong","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"1,108,35,174\"}]"} {"title":"...the coefficient of static friction (which depends on the properties of the two surfaces in contact)","description":"Correct!","type":"correct","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"174,124,215,171\"}]"} {"title":"...and the normal force pressing the object against a surface.","description":"Incorrect","type":"incorrect","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"228,124,259,156\"}]"}

Question

0sKok+Y8KleWp6xbpkUD8fD8vEWHX+5ng67BynG/V0Y11EUXiLr7MbzEl+5ObOmCPvWe5RiYrR3oucf+8+Q3BizF3Q8=
{"title":"The magnitude of the force of static friction on an object","description":"Wrong","type":"incorrect","color":"#99CCFF","code":"[{\"shape\":\"poly\",\"coords\":\"82,133\"},{\"shape\":\"rect\",\"coords\":\"1,3,30,62\"},{\"shape\":\"rect\",\"coords\":\"23,7,24,11\"}]"} {"title":"....is less than or equal to a certain maximum value.","description":"Incorrect","type":"incorrect","color":"#ffcc00","code":"[{\"shape\":\"rect\",\"coords\":\"118,11,119,13\"},{\"shape\":\"rect\",\"coords\":\"92,4,122,65\"}]"} {"title":"The maximum force of static friction depends on...","description":"Wrong","type":"incorrect","color":"#333300","code":"[{\"shape\":\"rect\",\"coords\":\"1,108,35,174\"}]"} {"title":"...the coefficient of static friction (which depends on the properties of the two surfaces in contact)","description":"Wrong","type":"incorrect","color":"#000080","code":"[{\"shape\":\"rect\",\"coords\":\"174,124,215,171\"}]"} {"title":"...and the normal force pressing the object against a surface.","description":"Correct!","type":"correct","color":"#333333","code":"[{\"shape\":\"rect\",\"coords\":\"228,124,259,156\"}]"}

Review

The quantity \(\mu_s\) in Equation 5-1b is called the \(\textbf{coefficient of static friction}\). Its value depends on the properties of both surfaces in contact; for example, \(\mu_s\) has different values for steel on steel, for steel on glass, and for glass on glass. Because both \(f_s\) and \(n\) have units of force, Equation 5-1b tells us that \(\mu_s\) must be dimensionless.