letter writing for 2nd pu
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What is Static Friction?
When the body is in static (stationary) state, frictional forces acting on the body is known as static frictional forces. In this case, the vector sum of the external forces acting on the body is equal to the magnitude of the frictional forces but opposite in direction; hence the body remains in equilibrium. The frictional forces increase proportional to the resultant external force acting on the body until it reaches a limit and starts to move. The maximum static friction is the limiting friction.
Friction is independent of the contact area of the two surfaces and depends on the material and the nature of the body. Once the resultant external force exceeds the limiting friction the body starts to move.
What is Sliding (Dynamic) Friction?
When the body is in motion, the frictional forces acting on the body is known as the dynamic frictional forces. The dynamic frictional force is independent of the velocity and acceleration. The ratio between the frictional force and the normal force between the surfaces also remains a constant but slightly less than the ratio for the limiting friction.
What is the difference between Static Friction and Sliding (Dynamic) Friction?
• Coefficient of static friction is slightly higher than the coefficient of dynamic friction
• Static friction varies proportional to the external forces, while the sliding (dynamic) frictional forces remain constant, independent of velocity and the acceleration (and the resultant external force).
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