If the mass of a sliding object is increased while everything else remains the same, its kinetic friction is Select one: а. decreased. b. increased. c. remains the same. d. Not enough information to answer this question.

13. Blocks A and B are connected by a cable that passes through two pulleys of negligible mass, as shown in the figure. The kinetic coefficient of friction between the inclined plane and block A is 0.4. If the initial velocity of A is 8 ft/s down the plane, determine how far A travels and how much time it takes to stop. P=0.4 20° 8 pies/s A 10 lb B 6lb

2. You are helping a friend move. Consider two boxes which have masses in factors of m; one of mass 6m and the other of mass 7m. The coefficient of static friction between the two boxes is very large. The coefficient of static friction between the boxes and the floor is 0.7 and the coefficient of kinetic friction is 0.1. You place the large box on top of the small box and slide them down a 1m high ramp out of the truck. The ramp is frictionless because it is covered with wheels. The box slides down this ramp smoothly onto the horizontal grass with coefficient of kinetic friction is 0.142857142857143. How far (in meters) will the boxes slide before they stop?

2. A 110 g hockey puck sent sliding over ice is stopped in 15 m by the frictional force on it from the ice. (a) If its initial speed is 6.0 m/s, what is the magnitude of the frictional force? (b) What is the coefficient of friction between the puck and the ice?

1- A 4.0-kg block slides down a 35° incline at a constant speed when a 16-N force is applied acting up and parallel to the incline. What is the coefficient of kinetic friction between the block and the surface of the incline? Answer = 0.2

4. You are pushing horizontally with a 300 N force on a box that is on an inclined plane as shown. The mass of the box is 30 kg and the incline is at a 25 degree angle off the Fapplied horizontal. The coefficient of kinetic friction between the box and the incline is 0.3, and the coefficient of static friction i 0.4. Assuming the box was at rest at t=0 when the force is initially applied, is the box moving up the ramp, down the ramp, or is it at rest after the force has been applied? 25⁰

5. A 7.6 kg object is at rest on an inclined plane. If the inclined plane makes an angle with the horizontal of 33°, what is the coefficient of static friction between the object and the plane? Assume the box is just about to slide and this is the maximum static friction.

3. A 6.50 kg block is pressed against a vertical wall by a force (F), as shown in the figure below. The coefficient of static friction between the block and the wall is 0.41 and the directional angle 0 for the force is 46º. Determine the magnitude of the force (F) when the block is about to slide up the wall. N F é

2. A block of mass 3.00 kg is pushed up against a wall by a force P that makes a 50.0° angle with the horizontal as shown in the figure. The coefficient of static friction between the block and the wall is 0.250. Determine the possible values for the magnitude of P that allow the block to remain stationary 50.0° P

7. The velocity of a freefalling skydiver is well modeled by the differential equation ma = mg – kv². where m is the mass of the skydiver, g is the gravitational constant, k and is the drag coefficient determined by the position of the diver during the dive. Calculate the maximum velocity of the skydiver.