How does the magnitude of the kinetic frictional force on an object depend on the normal force on the object?   How do you determine the value of the coefficient of kinetic friction from a kinetic frictional force vs normal force graph? What role does the kinetic frictional force play as a crate slides down a ramp? How could you change the angle of the ramp to your advantage as you unload the props?

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How does the magnitude of the kinetic frictional force on an object depend on the normal force on the object?  

How do you determine the value of the coefficient of kinetic friction from a kinetic frictional force vs normal force graph?

What role does the kinetic frictional force play as a crate slides down a ramp? How could you change the angle of the ramp to your advantage as you unload the props?

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