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The friction coefficient between the object and the surface is 0.62. More force are required to start a motion Example - Friction ForceĪ 100 lb wooden crate is pushed across a concrete floor. Note that static coefficients are somewhat higher than the kinetic or sliding coefficients. Static frictional coefficients are used for objects without relative motion. Kinetic or sliding frictional coefficients are used with relative motion between objects. Kinetic (Sliding) versus Static Frictional Coefficients
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It can be as low as 40 - 50% of the quoted dynamic value. If the static situation is considered at the same pressure, but at ambient temperature, then the static coefficient of friction is often significantly LOWER than the average quoted dynamic value. With many brake materials the dynamic coefficient of friction quoted is an "average" value when the material is subject to a range of sliding speeds, surface pressures and most importantly operating temperatures. This is a very simplistic statement and quite misleading for brake materials. Note! It is commonly thought that the static coefficients of friction are higher than the dynamic or kinetic values. Kinetic or sliding frictional coefficient only when there is a relative motion between the surfaces. The friction force due to gravity (1) can with (2) be modified toĪ g - acceleration og gravity (9.81 m/s 2, 32 ft/s 2)įriction Coefficients for some Common Materials and Materials Combinations static friction force - when an object makes an effort to moveįor an object pulled or pushed horizontally the normal force - N - is simply the gravity force - or weight:Ī g = acceleration of gravity (9.81 m/s 2, 32 ft/s 2).kinetic (sliding) friction force- when an object moves.There are at least two types of friction forces N = normal force between the surfaces (N, lb) Μ = static (μ s) or kinetic (μ k) frictional coefficient The friction force is the force exerted by a surface when an object moves across it - or makes an effort to move across it.