Maximum force of static friction formula
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The formula is µ = f / N, where µ is the coefficient of friction, f is the amount of force that resists motion, and N is the normal force. Normal force is the force at which one surface is being pushed into another. If a rock that weighs 50 newtons is lying on the ground, then the normal force is that 50 newtons of force.
diagrams that relate gravity, friction, and the normal force. Static friction has a maximum value – it can only hold back so much force. Frictional force is related to the normal force on an object by s (the coefficient of static friction): Ff≤ sN. If an object is moving with frictional effects, we call this kinetic friction and use k (the ...