A ball is given a speed v o a rugh horizontal surface. The ball travels through a distance l on the surface and stops. A. What are the initial and final kinetic energies of the ball? b. What is the work done by the kinetic friction?

A small ball ( uniform solid sphere ) of mass m is released from the top of a wedge of the same mass m . The wedge is free to move on a smooth horizontal surface. The ball rolld without sliding on the wedge. The required height of the wedge are mentioned in the figure. The total kinetic energy of the ball just before it falls on the ground

A block of mass 5 kg is initially at rest on a rough horizontal surface. A force of 45 N acts over a distance of 2 m . The force of friction acting on the block is 25 N . The final kinetic energy of the block is

A block of mass m is given velocity v_0 on a rough horizontal surface. After traveling a distance d. Its speed becomes (v_0)//(2) . Find the work done against friction. The work donw by friction and the coefficient of friction.

If a body has kinetic energy. T, moving on a rough horizontal surface stops at distance y. The frictional force exerted on the body is

A ball moves over a fixed track as shown in the figure. From A and B the ball rolls without slipping. If surface B is frictionless and K_(A),K_(B) and K_(C) are kinetic energies of the ball at A,B and C respectively then:

A ball of density d is dropped on to a horizontal solid surface. It bounces elastically from the surface and returns to its original position in a time t_1 . Next, the ball is released and it falls through the same height before striking the surface of a liquid of density of d_L (a) If dltd_L , obtain an expression (in terms of d, t_1 and d_L ) for the time t_2 the ball takes to come back to the position from which it was released. (b) Is the motion of the ball simple harmonic? (c) If d=d_L , how does the speed of the ball depend on its depth inside the liquid? Neglect all frictional and other dissipative forces. Assume the depth of the liquid to be large.

In Fig. , a ball of mass m = 60 g is shot with speed v_i = 22 m/s into the barrel of a spring gun of mass M= 240 g initially at rest on a frictionless surface. The ball sticks in the barrel at the point of maximum compression of the spring. Assume that the increase in thermal energy due to friction between the ball and the barrel is negligible. (a) What is the speed of the spring gun after the ball stops in the barrel? (6) What fraction of the initial kinetic energy of the ball is stored in the spring?

A 4.00g bullet travelling horizontally with a velocity of magnitude 500m//s is fired into a wooden block with a mass of 1.00kg , initially at rest on a level surface. The bullet passes through the block and emerges with speed 100m//s . The block slides a distance of 0.30m along the surface from its initial position. (a) What is the coefficient of kinetic friction between block and surface? (b) What is the decrease in kinetic energy of the bullet? (c) What is the kinetic energy of the block at the instant after the bullet has passed through it? Neglect friction during collision of bullet with the block.

A block begins to move on a rough horizontal surface with an initial velocity u. If it loses of its initial kinetic energy in time t, the coefficient of kinetic friction between the block and the surface is