A student applies a 200 N force at an angle 60° below the horizontal to a 20 kg box initially at rest on a level surface. The applied force causes the box to accelerate. The coefficient of kinetic friction between the box and the surface is 0.25. What is the normal force on the box? What is the friction force on the box? What is the box’s acceleration?

Three blocks rest on a frictionless, horizontal table (see figure below), with m₁ block 1, and the acceleration of all three blocks is found to be 3.2 m/s². (a) Find m₂. m1 kg m₂ m3 = 5 kg and m3 = 14 kg. A horizontal force F = 117 N is applied to (b) What is the magnitude of the normal force between blocks 2 and 3? N

A 40 N box is resting on a table when a 20 N force is applied to it horizontally. The coefficients of static and kinetic friction are 0.3 and 0.1, respectively. Which of the following best describes the resulting motion of the box?    The motion of the box cannot be determined with the given information.      The box accelerates in the direction of the applied force.      The box remains at rest.      The box moves with a constant velocity in the direction of the applied force.

A cardboard box rests on the floor of an elevator. The box has a mass m = 2.75 kg and the elevator has an upward acceleration of a.   a.  Write an expression for the sum of the forces acting on the box in the y-direction, ΣFy, given that up is the positive y-direction. Your answer should be in terms of FN, m, and g.  b. Write an expression for the normal force, FN, that the block experiences in terms of the elevator's acceleration, the block's mass, and the acceleration of gravity.  c.  If the elevator's acceleration has a magnitude of g in the downward direction, what would the normal force, FN1 be in Newtons?  d.If the elevator's acceleration had a magnitude of g in the upward direction, what would the normal force FN2 be in Newtons?

A teenager of mass m1 = 56 kg pushes backwards against the ground with his foot as he rides his skateboard. This exerts a horizontal force of magnitude F foot = = 18.5 N. The skateboard has m2 = 2.6 kg. a. Write an expression for the magnitude of the horizontal component of force that the ground exerts on the teenagers foot, F ground. b. Write an expression in terms to given quantities for the magnitude of the skateboard acceleration, a , while the teenager is pushing backwards on the ground? c. What is the numerical value of the magnitude of the acceleration, a, in m/s square?

Mr. Doyle is pulling his friend up a 25 degree hill in a sled. He is pulling with a force of 676N at an angle of 30 degrees to the incline. The sled starts from rest and has an acceleration of 1.24m/s squared. If the normal force is 328.8N, what is the mass of the sled? What is the coefficient of friction between the sled and the snow? How fast is the sled moving at the top of a 25.0m hill? How long does it take Mr. Doyle to transport his passengers to the top of the hill?

A1 kg cart is connected to a 2 kg cart. The 1 kg cart feels 9 N of friction and the 2 kg cart feels 18 N of friction. If you pull on the 2 kg cart with a force of 36 N to the right. what is the force of tension between the two carts?

Find T₁ The hanging sphere off the table has a mass of 2.98 kg. The string makes a 27.1° angle to the ceiling. How much does the sphere weigh? N Find T₂ T₁ N N e N The block on the table does not move. How much friction must be acting between the table and the block?