define static friction
Answers
Static Friction
Static friction is a force that keeps an object at rest. It must be overcome to start moving the object. Once an object is in motion, it experiences kinetic friction. If a small amount of force is applied to an object, the static friction has an equal magnitude in the opposite direction. If the force is increased, at some point the value of the maximum static friction will be reached, and the object will move. The coefficient of static friction is assigned the Greek letter "mu" (μ), with a subscript "s". The maximum force of static friction is μs times the normal force on an object.
force of static friction ≤ (coefficient of static friction)(normal force) maximum force of static friction = (coefficient of static friction)(normal force)
Fs ≤ μs η , and Fsmax = μs η
Fs = force of static friction
μs = coefficient of static friction
η = normal force (Greek letter "eta")
≤ means "less than or equal to"
Fsmax = maximum force of static friction
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In simple words ......
The friction acting between two surfaces in contact when there is no relative motion between them is called static friction