A crate of mass 20 kg is sliding across a wooden floor. The coefficient of kinetic friction between the crate and the floor is 0.3.
If the crate is being pulled by a force of 90 N (parallel to the floor), find the acceleration of the crate.

If the coefficient of kinetic friction be in above question then the initial acceleration of the crate will be :

A person pushes horizontally with a force of 220 N on a 55 kg crate to move it across a level floor. The coefficient of kinetic friction between the crate and the floor is 0.35. What is the magnitude of (a) the frictional force?

A man of mass 75 kg is pushing a heavy box on a flat floor. The coefficient of kinetic and static friction between the floor and the box is 0.20 , and the coefficient of static friction between the man's shoes and the floor is 0.80 . If the man pushes horizontally, what is the maximum values (in kg ) of the box he can move?

A block of mass m is placed on a rough floor of a lift . The coefficient of friction between the block and the floor is mu . When the lift falls freely, the block is pulled horizontally on the floor. What is the force of friction -

A block of mass 2 kg is at rest on a floor . The coefficient of static friction between block and the floor is 0.54. A horizonatl force of 2.8 N is applied to the block . What should be the frictional force between the block and the floor ? ( take , g = 10 m//s^(2) )

A crate is pulled along a horizontal surface at constant velocity by an applied force F that makes an angle theta with the horizontal. The coefficient of kinetic friction between the crate and the surface is mu . Find the angle theta such that the applied force is minimum to slide the block. Also find the minimum value of this force.

A crate of mass m is pulled with a force F along a fixed right angles horizontal trough as in figure. The coefficient of kinetic friction between the crate and the trough is mu . Find the value of force F required to pull it along the trough with constant velocity.

A 3.5 kg block is pushed along a horizontal floor by a force vecF of magnitude 15 N at an angle theta = 40^(@) with the horizontal (Fig. 6-33). The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (a) the frictional force on the block from the floor and (b) the block's acceleration.