A person pushes on a stationary 125 N box with 75 N at 30° below the horizontal. The coefficient of static friction between the box and the horizontal floor is 0.80. (a) Make a free-body diagram of the box. (b) What is the normal force on the box? (c) What is the friction force on the box? (d) What is the largest the friction force could be? (e) The person now replaces his push with a 75 N pull at 30° above the horizontal. Find the normal force on the box in this case.

A block of mass m1 = 3.9 kg is placed on top of a block with mass m2 = 5.4 kg. A force, F = is applied to m2, at an angle 16.1 degrees above the horizontal.  If the coefficient of static friction between all moving surfaces is 0.42 and the coefficient of kinetic friction is 0.32, determine the magnitude of the minimum force that will get the blocks moving.

A  55.1-kg crate rests on a level floor at a shipping dock. The coefficients of static and kinetic friction are  0.539 and  0.417, respectively. What horizontal pushing force is required to (a) just start the crate moving and (b) slide the crate across the dock at a constant speed? (a) Number Type your answer for part (a) here Units Choose your answer for part (a) here   (b) Number Type your answer for part (b) here Units Choose your answer for part (b) here

A heavy sled is being pulled by two people, as shown in the figure. The coefficient of static friction between the sled and the ground is , = 0.579, and the kinetic friction coefficient is = 0.419. The combined mass of the sled and its load is m = 351 kg. The ropes are separated by an angle = 21.0. and they make an angle 0 = 30.1° with the horizontal, Assuming both ropes pull equally hard, what is the minimum rope tension required to get the sled moving? 1214.39 minimum rope tension: incorrect If this rope tension is maintained after the sled starts moving, what is the sled's acceleration? 1.56 acceleration: Attempt 1 N m/s?

An incline makes an angle of 15.4 with the horizontal. A 6.50-kg block slides down the incline. The coefficient of kinetic friction between the block and the incline is 0.100. (a) Determine the magnitude of the weight of the block. N (b) Determine the magnitude of the normal force on the block. N (c) Determine the magnitude of the friction force on the block. (d) Determine the magnitude of the net force on the block. N (e) Determine the magnitude of the acceleration of the block. m/s? (f) If the block starts from rest, determine the block's speed after it slides a distance of 1.00 m along the incline. m/s

A block is placed on a wooden plank, which is initially horizontal.  One end of the plank is slowly raised to make it more and more inclined, and for a while the block stays in place on the plank and doesn't slide due to static friction.  Finally, when the plank reaches an incline of 56.3oabove horizontal, the block begins to slide.  What is the  coefficient of static friction between the block and the plank?

Two children are pulled on a sled over snow-covered ground. The sled is pulled by a rope that makes an angle of 35° with the horizontal. The children have a combined mass of 45 kg and the sled has a mass of 5.0 kg. The coefficients of static and kinetic friction are u, = 0.20 and µ, = 0.15. Calculate the maximum possible force of static friction between the sled and snow. If the tension in the rope is 95 N, will the sled move? Justify your answer.

You managed to pull a heavy crate up a ramp on a truck. The crate has mass 45 kg. You were pulling with 478 N of force along the ramp while the ramp made an angle of theta=25.5 degrees with the horizontal. The coefficient of kinetic friction between the crate and the ramp is 0.47. What is the acceleration of the crate along the ramp?

You are pushing a box, apply Fa = 90 N.  The box's mass is 25 kg.  The coefficients of friction are μs =0.60 and μk = 0.4.  The box was stationary when you began pushing.  Calculate the frictional force magnitude exerted on the box by the floor

The coefficient of static friction between an 8 kg box at rest and a 35° inclined plane is 0.70. Determines whether the object starts moving or stays in a static state. Justify your answer. If the object starts moving, what happens to the coefficient of friction? Also, describes the movement of the box.