The 121-lb force P is applied to the 250-lb crate, which is stationary before the force is applied. Determine the magnitude and direction of the friction force F exerted by the horizontal surface on the crate. The friction force is positive if to the right, negative if to the left. Assume μ = 0.45, μk = 0.36. Answer: F= i lb

A child has mass 24.0 kg and slides down a 23° incline with constant speed under the action of a 91.9 N frictional force acting up and parallel to the incline. What is the coefficient of kinetic friction between the child and the surface of the incline? ?k =

A block of wood weighing 4N is placed on a horizontal table. It is then pulled by means of a spring balance attached to one of it's ends. The block just begins to move when the spring balance records a horizontal force of 2.5N. 1) what is the coefficient of static friction? 2) what is the frictional force when a horizontal force of 2.0N is recorded by the spring balance

An early submersible craft for deep-sea exploration was raised and lowered by a cable from a ship. When the craft was stationary, the tension in the cable was 6500 N. When the craft was lowered or raised at a steady rate, the motion through the water added an 1800 N drag force.  What was the tension in the cable when the craft was being lowered to the seafloor?

A 6.00 kg box is pulled horizontally with a 40.0 N force that makes an angle of 50.0° with the horizontal. The coefficient of kinetic friction between the surface and the box is 0.230. Calculate the magnitude of the normal force and the acceleration of the box.

A large box of mass 11.4 kg sits on a ramp that makes an angle of 30.1 degrees with the horizontal. The surface of the ramp is rough and the coefficients of static and kinetic friction are given as 0.56 and 0,38, respectively. We exert a force up the ramp (parallel to the ramp surface) so that the box does not move. Calculate the maximum and the minimum magnitude of the force we can exert so that the box does not move. Enter the difference between the maximum and the minimum force values here: Fmax-Fmin (in Newtons). On your paper, show all the forces on free-body diagrams, clearly show your work, your derivation and calculations. Make sure to include your physics-based reasoning.

A person pushes horizontally with a force of 170. N on a 61.0 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.170. (a) What is the magnitude of the frictional force? (b)What is the magnitude of the crate's acceleration? Use g=9.81 m/s2.

A block is being pulled up an inclined plane by a force with magnitude F=45.0 N as shown In the figure above. The block has a mass of m =1.35 kg. The coefficient of kinetic friction between the block an the surface of the incline plane is µ = 0.287. The inclined plane makes an angle \theta= 31.7 degrees with respect to the horizontal. What is the magnitude of the acceleration of the mass?

Problem-1: A 5 kg object is pushed on a horizontal surface with a force of 5 N. Coefficient of static friction Hs= 0.3 and of kinetic friction H= 0.2. Find (a ) maximum static friction force (b) will the object move? g = 9.8 m/s?.

The 592-N force is applied to the 100-kg block, which is stationary before the force is applied. Determine the magnitude and direction of the friction force Fexerted by the horizontal surface on the block. The force is positive if to the right, negative if to the left. P = 592 N 31° Hg = 0.76 Hk = %3D = 0.57 Answer: F = N