What Is the Coefficient of Kinetic Friction?
The dynamic friction factor (or coefficient of dynamic friction) is the ratio between the frictional force and the positive pressure when objects in contact with each other make relative movements . When the object is in horizontal motion, positive pressure = gravity. Different materials have different dynamic friction factors. The rougher the object, the larger the dynamic friction factor.
- (1) Surface roughness affects the dynamic friction factor
- (2) Temperature affects dynamic friction factor
- (3) Different molecular structures on the surface of various materials affect the dynamic friction factor [1]
- Why are the friction factors different between different materials? The cohesive gravity between molecules on the contact surfaces between different materials is different, and it will affect the friction between objects, so the friction factors between different materials will be different. The table below shows the dynamic friction factors between several materials.
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- And the dynamic friction factor of some materials is also related to the conditions of friction. For example, the dynamic friction factor between glass and glass under dry friction is 0.4, but the dynamic friction factor under lubrication friction is 0.09. The dynamic friction coefficient between common metals has such characteristics. Adhesion between the same metal or metals with greater mutual solubility is prone to increase the dynamic friction factor. However, due to the poor mutual solubility between different metals, they do not Prone to adhesion, the dynamic friction factor is generally low.
- (1) Converting the measurement of dynamic friction factor into the measurement of moving distance
- (2) Converting the measurement of dynamic friction factor into the measurement of acceleration
- (3) Convert the measurement of dynamic friction factor into the measurement of angle
- (4) Transforming moving objects into stationary objects [3]