Physics midterm review fall 2018

Transcription

1 Physics midterm review fall 2018 Name: ate: 1. Which vector below represents the resultant of the two displacement vectors shown? Two forces ( O and O) act simultaneously at point O as shown on the diagram. The magnitude of the resultant force is closest to. 8.0 N. 11 N. 15 N. 16 N 2. What is the magnitude of the resultant of a 3.0-meter displacement and a 4.0-meter displacement as shown in the diagram?. 1.0 meter. 5.0 meters. 7.0 meters. 12 meters 5. Which vector shown represents the resultant of the concurrent vectors and in the diagram given?.. 3. Which vector best represents the resultant of forces F 1 and F 2 acting concurrently on point P, as shown in the diagram? page 1

2 6. Which combination of concurrent forces could not produce equilibrium?. 10 N, 20 N, and 50 N 9. The vector diagram below represents the horizontal component, F H, and the vertical component, F V, of a 24-newton force acting at 35 above the horizontal.. 20 N, 30 N, and 50 N. 30 N, 40 N, and 50 N. 40 N, 40 N, and 50 N 7. Which pair of concurrent forces could produce a resultant force having a magnitude of 10 newtons?. 10 N, 10 N. 10 N, 30 N. 4.7 N, 4.7 N. 4.7 N, 5.0 N What are the magnitudes of the horizontal and vertical components?. F H = 3.5 N and F V = 4.9 N. F H = 4.9 N and F V = 3.5 N. F H = 14 N and F V = 20. N. F H = 20. N and F V = 14 N 8. The accompanying diagram shows a projectile moving with speed v at the top of its trajectory. 10. car accelerates uniformly from rest to a speed of 10 meters per second in 2 seconds. The acceleration of the car is Which vector best represents the acceleration of the projectile in the position shown? m/sec 2. 5 m/sec m/sec m/sec 2.. page 2 Physics midterm review fall 2018

3 11. The diagram here shows a 1-kilogram stone being dropped from a bridge 100 meters above a gorge. 13. Which velocity-time graph represents the motion of an object moving with constant acceleration?.... Which graph of distance traveled versus time represents the motion of the freely falling stone? n object starting from rest accelerates at a rate of 3.0 meters/seconds squared for 6.0 seconds. The velocity of the object at the end of this time is m/s. 2.0 m/s 12. n object falls freely from rest for three seconds. The acceleration of the object is. 3.0 m/s. 18 m/s. 10 m/sec. 10 m/sec m/sec. 30 m/sec 2 page 3 Physics midterm review fall 2018

4 15. The graph shown represents the relationship between velocity and time for a 2.0-kilogram cart that is initially at rest and starts moving northward. 17. The diagram pictured shows speed as a function of time for four cars,,,, and, in straight-line motion. Which car experienced the greatest average acceleration during this 6.0-second interval? What is the acceleration of the cart shown at t = 8 seconds?. car. car. car. car. 0 m/s m/s m/s m/s car is traveling at a constant speed of 14 meters per second along a straight highway. tree and a speed limit sign are beside the highway. s it passes the tree, the car starts to accelerate. The car is accelerated uniformly at 2.0 meters per second 2 until it reaches the speed limit sign, 5.0 seconds later. 16. clam dropped by a sea gull takes 3.0 seconds to hit the ground. What is the sea gull s approximate height above the ground at the time the clam was dropped?. 15 m. 30 m. 45 m. 90 m When the car reaches the sign, the car s speed is. less than the speed limit. greater than the speed limit. equal to the speed limit page 4 Physics midterm review fall 2018

5 19. What is the distance between the tree and the sign? 22. The accompanying diagram shows a worker using a rope to pull a cart.. 10 m. 25 m. 70 m. 95 m 20. Oil drips at 0.4-second intervals from a car that has an oil leak. Which pattern best represents the spacing of oil drops as the car accelerates uniformly from rest? The worker s pull on the handle of the cart can best be described as a force having..... magnitude, only. direction, only. both magnitude and direction. neither magnitude nor direction 21. Forces F 1 and F 2 act concurrently on point P, as shown in the accompanying diagram. 23. Which pair of forces acting concurrently on an object will produce the resultant of greatest magnitude?.... The equilibrant of F 1 and F 2 is. 14 N southwest. 14 N southeast. 20. N southwest. 20. N southeast page 5 Physics midterm review fall 2018

6 24. high school physics student is sitting in a seat reading this question. The magnitude of the force with which the seat is pushing up on the student to support him is closest to. 0 N. 60 N. 600 N. 6,000 N kilogram red ball is thrown horizontally at a speed of 4 meters per second from a height of 3 meters. 0.4-kilogram green ball is thrown horizontally from the same height at a speed of 8 meters per second. ompared to the time it takes the red ball to reach the ground, the time it takes the green ball to reach the ground is. one-half as great. twice as great. the same. four times as great 25. ase your answer(s) to the following question(s) on the information below. soccer player accelerates a 0.50-kilogram soccer ball by kicking it with a net force of 5.0 newtons. What is the magnitude of the force of the soccer ball on the player s foot? 29. ase your answer(s) to the following question(s) on the information and diagram below. 26. n airplane is moving with a constant velocity in level flight. ompare the magnitude of the forward force provided by the engines to the magnitude of the backward frictional drag force. In the scaled diagram, two forces, F 1 and F 2, act on a 4.0-kilogram block at point P. Force F 1 has a magnitude of 12.0 newtons, and is directed toward the right. 27. ase your answer(s) to the following question(s) on the information below. manufacturer s advertisement claims that their 1,250-kilogram (12,300-newton) sports car can accelerate on a level road from 0 to 60.0 miles per hour (0 to 26.8 meters per second) in 3.75 seconds. etermine the magnitude of the net force acting on the block. What is the normal force exerted by the road on the car? page 6 Physics midterm review fall 2018

7 30. The diagram below shows a 5.00-kilogram block at rest on a horizontal, frictionless table. 32. ompared 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. less. greater. the same Which diagram best represents the force exerted on the block by the table? If a 65-kilogram astronaut exerts a force with a magnitude of 50. newtons on a satellite that she is repairing, the magnitude of the force that the satellite exerts on her is. 0 N. 50. N less than her weight. 50. N more than her weight. 50. N 31. ase your answer(s) to the following question(s) on the diagram below, which shows a 1.0-newton metal disk resting on an index card that is balanced on top of a glass. 34. carpenter hits a nail with a hammer. ompared to the magnitude of the force the hammer exerts on the nail, the magnitude of the force the nail exerts on the hammer during contact is What is the net force acting on the disk?. less. greater. the same. 1.0 N. 2.0 N. 0 N. 9.8 N page 7 Physics midterm review fall 2018

8 35. Two forces act concurrently on an object on a horizontal, frictionless surface, as shown in the diagram below. 37. blinking light of constant period is situated on a lab cart. Which diagram best represents a photograph of the light as the cart moves with constant velocity?.. What additional force, when applied to the object, will establish equilibrium?. 16 N toward the right N toward the left. 4 N toward the right. 4 N toward the left 38. The diagram represents a block sliding along a frictionless surface between points and G. 36. The uniform motion of a cart is shown in the distance versus time graph. What is the average speed of the cart?. 0.5 m/sec Which formula represents the velocity of the block as it moves along the horizontal surface from point E to point F?. 2 m/sec. 5 m/sec. v = s t. v = v m/sec. v f 2 = 2a s. v = 1 2 a( t)2 page 8 Physics midterm review fall 2018

9 39. ase your answer(s) to the following question(s) on the graph, which represents the relationship between the displacement of an object and its time of travel along a straight line. 41. ase your answer(s) to the following question(s) on the diagram and information below. machine launches a tennis ball at an angle of 45 with the horizontal, as shown. The ball has an initial vertical velocity of 9.0 meters per second and an initial horizontal velocity of 9.0 meters per second. The ball reaches its maximum height 0.92 second after its launch. [Neglect air resistance and assume the ball lands at the same height above the ground from which it was launched.] What is the average speed of the object during the first 4.0 seconds?. 0 m/s. 2 m/s. 8 m/s. 4 m/s The speed of the tennis ball as it leaves the launcher is approximately. 4.5 m/s. 8.3 m/s. 13 m/s. 18 m/s 40. In the accompanying diagram, a 100.-kilogram clown is fired from a 500.-kilogram cannon. If the clown s speed is 15 meters per second after the firing, then the recoil speed (v) of the cannon is. 75 m/s. 15 m/s 42. n object falls freely from rest near the surface of Earth. What is the speed of the object after having fallen a distance at 4.90 meters? m/s m/s m/s m/s. 3.0 m/s. 0 m/s page 9 Physics midterm review fall 2018

10 43. The diagram below represents a setup for demonstrating motion. 44. ase your answer(s) to the following question(s) on the information and diagram below. projectile is launched horizontally at a speed of 30. meters per second from a platform located a vertical distance h above the ground. The projectile strikes the ground after time t at horizontal distance d from the base of the platform. [Neglect friction.] When the lever is released, the support rod withdraws from ball, allowing it to fall. t the same instant, the rod contacts ball, propelling it horizontally to the left. Which statement describes the motion that is observed after the lever is released and the balls fall? [Neglect friction.]. all travels at constant velocity.. all hits the tabletop at the same time as ball.. all hits the tabletop before ball.. all travels with an increasing acceleration. alculate the horizontal distance, d, if the projectile s total time of flight is 2.5 seconds. [Show all work, including the equation and substitution with units.] 45. On the diagram above, sketch the theoretical path of the projectile. 46. Express the projectile s total time of flight, t, in terms of the vertical distance, h, and the acceleration due to gravity, g. [Write an appropriate equation and solve it for t.] page 10 Physics midterm review fall 2018

11 47. ase your answer(s) to the following question(s) on the information and diagram below. projectile is launched into the air with an initial speed of vi at a launch angle of 30. above the horizontal. The projectile lands on the ground 2.0 seconds later. 50. s shown in the diagram below, a student standing on the roof of a 50.0-meter-high building kicks a stone at a horizontal speed of 4.00 meters per second. On the diagram above, sketch the ideal path of the projectile. 48. ase your answer(s) to the following question(s) on the information and diagram below. projectile is launched into the air with an initial speed of v i at a launch angle of 30. above the horizontal. The projectile lands on the ground 2.0 seconds later. How much time is required for the stone to reach the level ground below? [Neglect friction.] s s s s How does the maximum altitude of the projectile change as the launch angle is increased from 30. to 45 above the horizontal? [ssume the same initial speed, v i.] 49. How does the total horizontal distance traveled by the projectile change as the launch angle is increased from 30. to 45 above the horizontal? [ssume the same initial speed, v i.] page 11 Physics midterm review fall 2018

12 51. Four identical projectiles are launched with the same initial speed, v, but at various angles above the level ground. Which diagram represents the initial velocity of the projectile that will have the largest total horizontal displacement? [Neglect air resistance.].... page 12 Physics midterm review fall 2018

13 Problem-ttic format version c Educide Software Licensed for use by Simone Shaker Terms of Use at Physics midterm review fall /28/ N or -5.0 N They are equal ,300 N N

14 Teacher s Key Page d = 75 m 46. t = 2h g projectile s maximum altitude will increase. total horizontal distance will increase.