Direction Of Frictional Force

A block of mass 2 kg is pressed against a rigid vertical wall by a horizontal force of 100 N. If co-efficient of static and kinetic friction are each equal to 0.3 then find the magnitude and direction of frictional force on the block.

(i) Explain why friction is necessary to make the disc to roll in the direction indicated. (ii) Give the direction of frictional force at B , and the sense of frictional torque, before perfect rolling begins. (iii) What is the force of friction after perfect rolling begins?

Two identical ladders, each of mass M and length L are resting on the rough horizontal surface as shown in the figure. A block of mass m hangs from P. If the system is in equilibrium, find the magnitude and the direction of frictional force at A and B.

Two identical ladders, each of mass M and length L are resting on the rough horizontal surface as shown in the figure. A block of mass m hangs from P. if the system is in equilibrium, find the magnitude and the direction of frictional force at A and B.

A man pushes a cylinder of mass m_1 with the help of a plank of mass m_2 as shown in figure. There in no slipping at any contact. The horizontal component of the force applied by the man is F. (a) the acceleration fo the plank and the center of mass of the cylinder, and (b) the magnitudes and direction of frictional force at contact points.

In the given figure a ring of mass m is kept on a horizontal surface while a body of equal mas 'm' attached through a string Which is wounded on the ring when the system is released the ring rolls without slipping consider the following statements and choose the correct option. (1)acceleration of the centre of mass of ring is (2g)/3 (2) acceleration of the hanging particle is (4g)/3 (3) frictional force (on the ring ) acts along forward direction (4) Frictional force (on the ring) acts along backward direction

A spool of mass m has moment of inertia I= 2mR^(2) about its axis of symmetry. The inner and outer radius of spool R and 2R respectively. Thread is wounded on the inner cylinder and its one end is pulled a force F acting at angle theta with horizontal. The surface is sufficiently rough and th.e spool never slides on the surface. Regarding to the direction of frictional force, which of the following statement is correct?

Find unit vector in direction of friction force acting on block vecv_p=7hati-2hatj, vecv_B=3hati+hatj