Coefficients of static and kinetic friction

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SUMMARY

The coefficients of static and kinetic friction for a crate on a cement floor are defined such that the static coefficient is twice the kinetic coefficient. This relationship indicates that the static frictional force acting on a stationary crate will always be twice the magnitude of the kinetic frictional force acting on the moving crate. The formula governing this relationship is F = μmg, where F represents the frictional force, μ is the coefficient of friction, and mg is the weight of the crate.

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  • Understanding of friction coefficients
  • Basic physics concepts related to force and motion
  • Knowledge of the formula F = μmg
  • Familiarity with static and kinetic friction definitions
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hatingphysics
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Suppose that the coefficients of static and kinetic friction have values such that the static coefficient is twice the value of the kinetic coefficient for a crate in contact with a cement floor. Does this mean that the magnitude of the static frictional force acting on the crate at rest would always be twice the magnitude of the kinetic frictional force acting on the moving crate? Give your reasoning.
 
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Yes, if the coefficients are a ratio of two, so will be the ratio of the forces. F=umg.
 

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