Friction (static & Kinetic) Review

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1 Friction (static & Kinetic) Review 1. Sand is often placed on an icy road because the sand A) decreases the coefficient of friction between the tires of a car and the road B) increases the coefficient of friction between the tires of a car and the road C) decreases the gravitational force on a car D) increases the normal force of a car on the road 2. A box decelerates as it moves to the right along a horizontal surface, as shown in the diagram. Which vector best represents the force of friction on the box? A) B) C) D) 3. A book weighing 20. Newtons slides at constant velocity down a ramp inclined 30. to the horizontal as shown in the diagram below. What is the force of friction between the book and the ramp? A) 10. N up the ramp B) 17 N up the ramp C) 10. N down the ramp D) 17 N down the ramp A) 40 N B) 20 N C) 10 N D) 5.0 N Name 4. The diagram below shows a student applying a 10.-newton force to slide a piece of wood at constant speed across a horizontal surface. After the wood is cut in half, one piece is placed on top of the other, as shown. What is the magnitude of the force, F, required to slide the stacked wood at constant speed across the surface? 5. When an object moves at a constant speed against friction on a horizontal tabletop, there is an increase in the object's A) temperature B) momentum C) potential energy D) acceleration 6. A 50.-Newton horizontal force is needed to keep an object weighing 500. Newtons moving at a constant velocity of 2.0 meters per second across a horizontal surface. The magnitude of the frictional force acting on the object is A) 500. N B) 450. N C) 50. N D) 0 N 7. A box is pushed toward the right across a classroom floor. The force of friction on the box is directed toward the A) left B) right C) ceiling D) floor 8. The diagram below represents a box shown sliding down an inclined plane. Toward which point will the force of friction on the box be directed? A) 1 B) 2 C) 3 D) 4

2 9. A constant unbalanced force of friction acts on a 15.0-kilogram mass moving along a horizontal surface at 10.0 meters per second. If the mass is brought to rest in 1.50 seconds, what is the magnitude of the force of friction? A) 10.0 N B) 100 N C) 147 N D) 150. N 10. A 1.0 x kilogram box rests on the bed of a truck that is accelerating at 2.0 meters per second 2. What is the magnitude of the force of friction on the box as it moves with the truck without slipping? A) 1.0 x 10 3 N B) 2.0 x 10 2 N C) 5.0 x 10 2 N D) 0.0 N 11. A wooden block is at rest on a horizontal steel surface. If a 10.-Newton force applied parallel to the surface is required to set the block in motion, how much force is required to keep the block moving at constant velocity? A) less than 10. N B) greater than 10. N C) 10. N 12. The diagram below shows a 4.0-kilogram object accelerating at 10. meters per second 2 on a rough horizontal surface. What is the magnitude of the frictional force Ff acting on the object? A) 5.0 N B) 10. N C) 20. N D) 40. N 13. In the diagram below, the upward drag force acting on a parachute is equal in magnitude but opposite in direction to the weight of the parachutist and equipment. As a result of the forces shown, the parachutist may be moving A) downward with decreasing speed B) downward at constant speed C) upward with decreasing speed D) upward with constant acceleration 14. When a 12-newton horizontal force is applied to a box on a horizontal tabletop, the box remains at rest. The force of static friction acting on the box is A) 0 N B) between 0 N and 12 N C) 12 N D) greater than 12 N 15. A box initially at rest on a level floor is being acted upon by a variable horizontal force, as shown in the diagram at the right. Compared to the force required to start the box moving, the force required to keep it moving at constant speed is A) less B) greater C) the same

3 16. Block A is pulled with constant velocity up an incline as shown in the diagram below. Which arrow best represents the direction of the force of friction acting on block A? A) B) C) D) 17. In the diagram below, surface B of the wooden block has the same texture as surface A, but twice the area of surface A If force F is required to slide the block at constant speed across the table on surface A, approximately what force is required to slide the block at constant speed across the table on surface B? A) F B) 2F C) F D) 4F

4 Base your answers to questions 18 through 20 on the diagram below which shows a cart held motionless by an external force F on a frictionless incline. 18. What is the magnitude of the external force F necessary to hold the cart motionless at point C? A) 4.9 nt. B) 2.0 nt. C) 9.8 nt. D) 19.6 nt. 19. Compared to the magnitude of the external force F required to hold the cart at point C on the frictionless surface, the magnitude of the external force F required to hold the cart at point C, if friction were present, is A) less B) greater C) the same 20. If the cart were allowed to move from point C to point A, the gravitational potential energy of the cart would A) decrease B) increase C) remain the same 21. The diagram below shows a granite block being slid at constant speed across a horizontal concrete floor by a force parallel to the floor. 22. The diagram below shows a block sliding down a plane inclined at angle with the horizontal. Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete? A) mass and speed of the block B) mass and normal force on the block C) frictional force and speed of the block D) frictional force and normal force on the block As angle is increased, the coefficient of kinetic friction between the bottom surface of the block and the surface of the incline will A) decrease B) increase C) remain the same 23. What is the magnitude of the force needed to keep a 60.-newton rubber block moving across level, dry asphalt in a straight line at a constant speed of 2.0 meters per second? A) 40. N B) 51 N C) 60. N D) 120 N

5 24. The diagram below represents a box sliding down an incline at constant velocity. Which arrow represents the direction of the frictional force acting on the box? A) A B) B C) C D) D 25. Jill is pulling a 200. Newton sled through the snow at constant velocity using a horizontal force of 10. Newtons. What is the kinetic coefficient of friction of the sled on the snow? A) 0.02 B) 0.05 C) 0.20 D) As more force is applied to a steel box sliding on a steel surface, the coefficent of kinetic friction will A) decrease B) increase C) remain the same 27. Compared to the force needed to start sliding a crate across a rough level floor, the force needed to keep it sliding once it is moving is A) less B) greater C) the same 28. A car s performance is tested on various horizontal road surfaces. The brakes are applied, causing the rubber tires of the car to slide along the road without rolling. The tires encounter the greatest force of friction to stop the car on A) dry concrete B) dry asphalt C) wet concrete D) wet asphalt 29. An 80-kilogram skier slides on waxed skis along a horizontal surface of snow at constant velocity while pushing with his poles. What is the horizontal force pushing him forward? A) 0.05 N B) 0.4 N C) 40 N D) 4N 30. What is the minimum horizontal force needed to start a 300. kilogram steel block on a steel table in motion? A) 5.70 N B) 7.40 N C) 1710 N D) 2220 N

6 Answer Key Friction Review 1. B 2. D 3. A 4. C 5. A 6. C 7. A 8. B 9. B 10. B 11. A 12. B 13. B 14. C 15. A 16. B 17. A 18. C 19. A 20. A 21. D 22. C 23. A 24. D 25. B 26. C 27. A 28. A 29. C 30. D

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