When two surfaces are in contact, friction forces oppose relative motion or impending motion. Friction forces are parallel to the surfaces in contact and oppose motion or impending motion. Static Friction: No relative motion.

Which type of friction opposes the impending motion?

Static friction opposes impending motion. Write the mathematical equation connecting the limiting value of static friction with normal reaction.

What is impending motion in friction?

Impending motion: Impending motion refers to the state just before surfaces start to slip. In this case the static frictional force has reached its upper limit and is given by the equation: The direction of the frictional force is opposite to the pending relative motion of the surfaces.