PHYS 100 Mid-Term #1

Transcription

1 D.W. Poppy Secondary School Physics 12 PHYS 100 Mid-Term #1 Name: Directions: Fill in the scantron form with the following information: 1. ID number (student number) 2. Name at top of form 3. Name bubbled into the columns labelled "C1C2C3C4" 4. Test Version Number (shown below); bubble in spaced labelled "version"on the form Version # 0

2 1. Which of the following statements correctly describes the motion of an object shown by the graph? a) b) c) d) e) the object has non-uniform motion the object has constant velocity the object has increasing velocity the object has constant non-zero acceleration the object has increasing acceleration 2. Which one of the following terms is defined as "the slope of a line tangent to a displacement-time graph"? a) average acceleration b) instantaneous acceleration c) instantaneous velocity d) average velocity 3. Select from the following statements the one that is true for the graph below. a) b) c) d) e) the acceleration during the first second is uniform and greater than 0. the velocity between t=1 s and t=3 s is uniform and greater than 0. the average speed is always equal to the magnitude of the average velocity the distance travelled between t=1 s and t=2 s is greater than the distance travelled between t= 0 s and t=1 s. none of the above are true 4. Which graph represents the motion of an object decreasing in velocity? a) b) c) d) e) MidTerm1 Page 1 Version 0 Mr. Furse

3 5. From the graph shown below it can be seen that at time t = 2.0 s the velocity changes from: a) b) c) d) e) 3.0 m/s to zero 6.0 m/s to zero 12 m/s to zero zero to 3 m/s 3.0 m/s to 1.5 m/s 6. What does the shaded area of this velocity versus time graph represent? a) t 2 t 1 b) v v 2 1 c) Displacement d) Average velocity 7. Which one of the following terms can be defined as "the slope of a line tangent to a velocity-time graph"? a) instantaneous velocity b) velocity c) average acceleration d) instantaneous acceleration 8. The graph shown below represents the velocity of an object moving in a straight line. From the graph, find the velocity of the object at time = 5.0 seconds. a) 0.0 m/s b) 5.0 m/s c) 6.5 m/s d) 26 m/s e) 40 m/s MidTerm1 Page 2 Version 0 Mr. Furse

4 9. If a body is accelerating, it MUST be changing speed. a) True b) False 10. A locomotive has a mass of kg. The engineer operates it when no cars are being pulled in such a way that he exerts the maximum possible force at any speed. The force depends on the speed. The speed of the locomotive, as function of time, under these conditions, is shown in the graph below. The acceleration of the locomotive when it is travelling at 7.0 m/s is closest to: a) 0.0 m/s 2 b) 0.16 m/s 2 c) 0.35 m/s 2 d) 0.63 m/s 2 e) 0.80 m/s This graph shows the speed of a 3 kg mass as a function of time. The average acceleration over the period 0 to 5 s is: a) 0 m/s 2 b) 1.0 m/s 2 c) 2.5 m/s 2 d) 1.25 m/s 2 e) 5.0 m/s This graph shows the velocity of a 3 kg mass as a function of time. What is the average velocity for the 5 second interval? a) 0 m/s b) 2.5 m/s c) 3.5 m/s d) 5.0 m/s e) 7.5 m/s MidTerm1 Page 3 Version 0 Mr. Furse

5 Use the following information to answer the next 1 question(s). The graph below shows the motion of three cars X, Y, and Z along a straight road. Car X is travelling at the speed limit while car Y is travelling at a speed in excess of the limit. The two cars pass a stationary police car Z at time t=0 and continue with uniform speed. The police car Z immediately gives chase with a constant acceleration until it reaches car Y. 13. Car Y is exceeding the speed limit by: a) 5 m/s b) 10 m/s c) 15 m/s d) 20 m/s e) 50 m/s 14. A projectile is fired from ground level such that it has an initial vertical speed of 20 m/s and initial horizontal speed of 30 m/s. How far from the point of firing does the projectile land? Take g=10 m/s 2, assume that the terrain is flat, and neglect air resistance. A. B. C. D. E. 40 m 60 m 80 m 120 m 180 m Use the following information to answer the next 2 questions. A ball with a speed of 5.7 m/s rolls along a horizontal table 1.4 m high and falls off the edge. (Air friction is insignificant.) 15. How long does the ball take to fall to the floor? A s B s C s D s MidTerm1 Page 4 Version 0 Mr. Furse

6 16. What is the magnitude of the vertical component of the ball's velocity 0.50 s after it starts to fall? A. 1.2 m/s B. 4.9 m/s C. 5.7 m/s D. 7.5 m/s Use the following information to answer the next 2 questions. A projectile is fired at 95 m/s at an angle of 22 above the horizontal. 17. Calculate the horizontal displacement of the projectile after 2.3 seconds. A. 56 m B. 83 m C. 203 m D. 301 m 18. Calculate the vertical displacement of the projectile after 2.3 seconds. A. 56 m B. 83 m C. 203 m D. 301 m 19. A missile is fired horizontally from the top of a 78.4 m building with an initial velocity of 50.0 m/s. Its horizontal range will be: A. 392 m. B m. C. 200 m. D. 98 m. 20. A police car moving 80 km/h is passed by a speeder moving at 120 km/h. The 1.5 seconds after the speeder passes the police car, the police car begins to accelerate uniformly at 3.0 m/s/s until it overtakes the speeding car. a) how long does it take to overtake the speeding car? b) how fast is the police car moving when it overtakes the speeding car? 21. a) A projectile of fired vertically upwards at 35 m/s from a point 300 m above the ground. What is it's velocity when it strikes the ground? b) How long loes it take to reach point X on the trajectory which is 210 meters above the ground? (6.00 marks) MidTerm1 Page 5 Version 0 Mr. Furse

7 22. A spring gun inclined at an angle of 45 to the horizontal fires a ball which leaves the muzzle of the gun 1.1 m above the floor. The initial velocity of the ball is 6.0 m/s. a) Determine the total time that the ball is in the air. b) Determine the horizontal range of the projectile. (7.00 marks) 23. Construct a position vs. time graph, a velocity vs. time graph, and an acceleration vs. time graph that represents the motion of the skydiver described below. Assume the skydiver's initial position is at the origin on the graph. (5.00 marks) the skydiver jumps from a stationary helicopter 3000 m above the ground. the skydiver's acceleration decreases until terminal velocity in achieved. after falling at terminal velocity for a while, the parachute is pulled. a new terminal velocity is achieved. after falling at terminal velocity for a while, the skydiver lands. MidTerm1 Page 6 Version 0 Mr. Furse