What is limiting friction?

What is rolling friction ? How does it arise ?

"The dynamic friction is a little less than the limiting friction ". Why ?

Assertion : The value of dynamic friction is less than the limiting friction. Reason : Once the motion has started, the inertia of rest has been overcome.

A : During horizontal circular turn of a car, the centripetal force required should be less than the limiting friction between its tyres and road. R : The centripetal force to car is provided by the frictional force between its tyres and the road.

Assertion : Angle of repose is equal to angle of limiting friction. Reason : When the body is just at the point of motion, the force of friction in this stage is called as limiting friction.

What is angle of friction?

For a body on a horizontal surface, coefficients of static and kinetic frictions are 0.4 and 0.2 respectively. When the body is in uniform motion on the surface, a horizontal force equal in magnitude to limiting friction is applied on it. The acceleration produced is

Matching block type LIST - I (a) Two rotating discs are brought in contact coaxially (b) Contact force on a body placed in on rough surface (c ) To continue a motion is easier than to initiate the motion (d) For a Static friction less than limiting friction LIST - II (e ) Generated friction is equal to appliedexternal force in magnitude (f) Loss of Rotational KE is transformed partly to heat (g) The resultant of normal reaction and friction (h) Kinetic friction is less than static friction

What is static friction ? Why is it called so ?

A block rests on a fixed rough inclined place and a horizontal force F is applied to it, as shown in the figure. Which of the following statements are correct? (A) Normal reaction on the block is Fsintheta + mgcostheta (B) The friction force is zero when Fcostheta=mgsintheta (C) The value of limiting friction is mu(mgsintheta+Fcostheta) (D) The value of limiting friction is mu(mgsintheta-Fcostheta)