A block of mass m is kept on a rough plank which moves with a horizontal acceleration a. If the plank was at rest at `t=0`, and the block does not slide relative to the plank, find the work done by friction on the (a) block, (b) plane, (c) system, (block+plank) during time `t`.

A block of mass m is placed in equilibrium on a moving plank. The maximum horizontal acceleration of the plank for mu=0.2 is:

A small block of mass m is kept on a rough inclined surface of inclination theta fixed in a car. The car moves with a uniform velocity v and the block does not slide on the wedge. The work done by the force of friction on the block in time t will be

A small block of mass m is kept on a rough inclined surface of inclination theta fixed in a car. The car moves with a uniform velocity v and the block does not slide on the wedge. The work done by the force of friction on the block in time t will be

A block of mass m is placed on the block of mass M as shown in figure. The horizontal force vecF acts on M during time interval t. If the horizontal surface is smooth, assuming no relative sliding between the blocks, find the a. work done by friction on the blocks b. work done by vecF on the lower block

A block of mass m is placed on the block of mass M as shown in figure. The horizontal force vecF acts on M during time interval t. If the horizontal surface is smooth, assuming no relative sliding between the blocks, find the a. work done by friction on the blocks b. work done by vecF on the lower block

A plank of mass 5 kg in kept on a smooth surface. A block of 1 kg is kept on it and is given a velcoity of 12 m/s. There is friction between the block and the plank. Assuming the plank to be very long, find the magnitude of work done (in Joules) by friction on block till the relative sliding between them stops.

A plank of mass 5 kg in kept on a smooth surface. A block of 1 kg is kept on it and is given a velcoity of 12 m/s. There is friction between the block and the plank. Assuming the plank to be very long, find the magnitude of work done (in Joules) by friction on block till the relative sliding between them stops.

A plank of mass M and length L is placed at rest on a smooth horizontal surface. A small block of mass m is projected with a velocity v_0 from the left end of it as shown in figure. The coefficient of friction between the block and the plank is m, and its value is such that the block becomes stationary with respect to the plank before it reaches the other end. a. Find the time and common velocity when relative sliding between the block and the plank stops. b. Find the work done by the friction force on the block during the period it slides on the plank. Is the work positive or negative? c. Calculate the work done on the plank during the same period. Is the work positive or negative? d. Also, determine the net work done by friction, Is it positive or negative?