A 60 kg girl runs and slides down a slip n’ slide where the coefficient of friction is 0.15. a. Calculate the force of friction the girl experiences.  b. What quantities would change if the girl ran and slid on a hardwood floor instead of the slip n’ slide.

Starting from rest, a 150 kg body experiences a force of 100 newtons acting on it in a direction parallel to the positive x-axis and a force of 150 newtons acting at 55° with respect to the positive x-axis. a. What is the net force acting on the body?  Include direction. b. What is the acceleration of the body? c. What velocity does it reach after 5 seconds?

You push a box of mass 27 kg on the frictional horizontal surface of the table.a.Calculate the weight of the box? b.Consider kinetic friction coefficient as 0.3, Calculate kinetic friction force? c. If the applied force is 120.0 N. Calculate the acceleration of the box?

1. Steve pushes a box across a level floor with a constant horizontal force. This causes the box to move at a constant speed, v. The force from Steve: a. has the same magnitude as the weight of the box. b. equals the sum of the box's weight and the total frictional forces opposing the box's motion. c. has the same magnitude as the frictional forces opposing the box's motion. d. has greater magnitude than the frictional forces opposing the box's motion. e. has greater magnitude than the weight of the box. 2. Steve now doubles the force he applies to th box from the previous problem. Which of the following is true? a. The box will move at double the previous speed. b. The box will move with a continuously increasing speed. c. The box will increase speed for a while, then move at a constant speed. d. The box will continue to move at the same speed for a while, then continually increase speed. e. The box will move at a greater constant speed, but not necessarily double the speed.

You push a lawnmower (mass=15kg) across the lawn at constant speed. To do so, you must excert 200 N of force. The handle makes a 35° angle with the horizontal.  A. Draw the force diagram B. What is the x-component of the force you apply? C. How does it compare to the frictional force which opposes your effort? Explain. D. If the frictional force is reduced to 100 N, determine the acceleration of the lawnmower.

5. A 3 kg book is held against a wall with a force F at an angle of 30° as shown below. The coefficient of friction of the wall with the book is 0.3. A. Draw a free body diagram for the book. B. Determine the minimum force F needed for the book not to slide down the wall.

Three boxes in contact slide side-by-side on a smooth, friction-less, horizontal floor. Their masses are 5.0-kg, 3.0-kg, and 2.0-kg, with the 3.0-kg box in the center. A force of 50 N pushes on the 5.0-kg box, which pushes against the other two boxes.   A. Draw the free-body diagrams for each of the boxes. B. What magnitude force does the 3.0-kg box exert on the 5.0-kg box? C. What magnitude force does the 3.0-kg box exert on the 2.0-kg box?

The net external force on the 25.5kg mower is 48.0N. If the force of friction is 22.5N. a. What force F in newtons is the person exerting on the mower? b.Suppose the mower is moving 1.10 m/s when the force F is removed. How fat will the mower go before stopping?

An orthodontist places 35 pounds of tension on the wire across your teeth.The insicor is just forward so that the wire is bent at 15 degrees on either side. a. What net force does the wire apply to the tooth? b. The tooth shifts and the ledt angle becomes 10 degrees while the right angle becomes 20 degrees. Assuming that the tension stays the same, what force is now applied to the tooth?

7. A bird has a mass of 24 g and perches in the middle of a stretched telephone line. a. Show that the tension in the line can be calculated using the equation T = mg2sine. Determine the tension when b. 0 = 5° and c. e = 0.5°. Assume that each half of the line is straight.