Additional Practice Test 1 Physics

Transcription

1 Name: ate: 1. person walks 5.0 kilometers north, then 5.0 kilometers east. His displacement is closest to 7.1 kilometers northeast 7.1 kilometers northwest 5. lab cart is loaded with different masses and moved at various velocities. Which diagram shows the cartmass system with the greatest inertia? 10 kilometers northeast 10 kilometers northwest 2. Which is a scalar quantity displacement distance force acceleration 3. car travels 20 meters east in 1.0 second. The displacement of the car at the end of this 1.0-second interval is 20 m 20 m/s 20 m east 20 m/s east 4. Which pair of graphs represent the same motion? page 1

2 6. ase your answer(s) to the following question(s) on the information below. In a drill during basketball practice, a player runs the length of the 30-meter court and back. The player does this three times in 60 seconds kilogram softball initially at rest is hit with a bat. The ball is in contact with the bat for 0.20 second and leaves the bat with a speed of 25 meters per second. What is the magnitude of the average force exerted by the ball on the bat? 8.3 N 15 N 3.0 N 75 N 11. Which two graphs best represent the motion of an object falling freely from rest near Earth s surface? The magnitude of the player s total displacement after running the drill is 0.0 m 30. m 60. m 180 m 7. The average speed of the player during the drill is 0.0 m/s 0.50 m/s 3.0 m/s 30. m/s 8. Forces F 1 and F 2 act concurrently on point P, as shown in the diagram. The equilibrant of F 1 and F 2 is 12. truck with an initial speed of 12 meters per second accelerates uniformly at 2.0 meters per second 2 for 3.0 seconds. What is the total distance traveled by the truck during this 3.0 second interval? 9.0 m 25 m 36 m 45 m 14 N southwest 14 N southeast 20 N southwest 20 N southeast 9. car having an initial speed of 16 meters per second is uniformly brought to rest in 4.0 seconds. How far does the car travel during this 4.0-second interval? 32 m 82 m 96 m 4.0 m 13. The mass of a physics textbook is closest to 10 3 kg 10 1 kg 10 0 kg 10 2 kg 14. Which combination of three concurrent forces acting on a body could not produce equilibrium? 1 N, 3 N, 5 N 2 N, 2 N, 2 N 3 N, 4 N, 5 N 4 N, 4 N, 5 N page 2

3 15. The diagram shows a student applying a 10-newton force to slide a piece of wood at constant speed across a horizontal surface. fter the wood is cut in half, one piece is placed on top of the other, as shown. 17. The accompanying vector represents the resultant of two forces acting concurrently on an object at point P. What is the magnitude of the force, F, required to slide the stacked wood at constant speed across the surface? 40 N 20 N 10 N 5.0 N Which pair of vectors best represents two concurrent forces that combine to produce this resultant force vector? 16. The accompanying diagram shows a child pulling a 50.-kilogram friend on a sled by applying a 300.-newton force on the sled rope at an angle of 40. with the horizontal. The vertical component of the 300.-newton force is approximately 510 N 230 N 190 N 32 N 18. Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the accompanying diagram. The acceleration of the block is 1.5 m/s 2 to the right 2.5 m/s 2 to the left 2.5 m/s 2 to the right 4.0 m/s 2 to the left page 3

4 19. The accompanying diagram shows a block on a horizontal frictionless surface newton force acts on the block at an angle of 30. above the horizontal. 23. Which terms both represent scalar quantities? displacement and velocity distance and speed displacement and speed distance and velocity What is the magnitude of force F if it establishes equilibrium? 50.0 N 86.6 N 24. Which graph best represents the motion of an object whose speed is increasing? 100. N 187 N 20. pproximately how far will an object near Earth s surface fall in 3.0 seconds? 88 m 44 m 29 m 9.8 m 21. The accompanying graph represents the relationship between the forces applied to an object and the corresponding accelerations produced. 25. Two students push on a sled. One pushes with a force of 30. newtons east and the other exerts a force of 40. newtons south, as shown in the topview accompanying diagram. What is the inertial mass of the object? 1.0 kg 2.0 kg Which vector best represents the resultant of these two forces? 0.50 kg 1.5 kg 22. Which is a derived unit? meter second kilogram newton page 4

5 26. series of unbalanced forces was applied to each of two blocks, and The accompanying graphs show the relationship between unbalanced force and acceleration for each block. 30. The accompanying diagram shows a granite block being slid at constant speed across a horizontal concrete floor by a force parallel to the floor. ompared to the mass of block, the mass of block is the same twice as great half as great four times as great 27. n airplane originally at rest on a runway accelerates uniformly at 6.0 meters per second 2 for 12 seconds. uring this 12-second interval, the airplane travels a distance of approximately 72 m 220 m 430 m 860 m 28. skier starting from rest skis straight down a slope 50. meters long in 5.0 seconds. What is the magnitude of the acceleration of the skier? 20. m/s m/s 2 Which pair of quantities could be used to determine the coefficient of friction for the granite on the concrete? mass and speed of the block mass and normal force on the block frictional force and speed of the block frictional force and normal force on the block 31. fter a model rocket reached its maximum height, it then took 5.0 seconds to return to the launch site. What is the approximate maximum height reached by the rocket? [Neglect air resistance.] 49 m 98 m 120 m 250 m 32. The accompanying diagram shows a horizontal 8.0-newton force applied to a 4.0-kilogram block on a frictionless table. 5.0 m/s m/s roller coaster, traveling with an initial speed of 15 meters per second, decelerates uniformly at 7.0 meters per second 2 to a full stop. pproximately how far does the roller coaster travel during its deceleration? 1.0 m 2.0 m 16 m 32 m What is the magnitude of the block s acceleration? 0.50 m/s m/s m/s 2 32 m/s The speed of a car is increased uniformly from 20. meters per second to 30. meters per second in 4.0 seconds. The magnitude of the car s average acceleration in this 4.0-second interval is 0.40 m/s m/s 2 10 m/s 2 13 m/s 2 page 5

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