Units 2, 3 and 6 Physics Review

Transcription

1 x (m) Units 2, 3 and 6 Physics Review 1. Construct a position-time graph for the motion described in the velocity-time graph shown below. Assume a position of zero at t = 0. Be sure to number the scale on the position axis. 2. Below is a qualitative motion map for Run-around Sue: On the coordinate axes below sketch a graph that generally describes Sue's motion (you need not plot points). t (s)

2 3. Consider the position vs time graph for Flipper below a) Determine Flipper's average speed. Show your work. b) Mathematically model the relationship between position and time. c) What will Flipper's position be at 10.0 s? Show how you got your answer. 4. Suppose that you are driving along at a steady 15 m/s (nearly 40 mph). Draw the v vs t graph on the axes below. At time t = 3.0 s, you reach down to tune in a different radio station, without changing speed At time t = 6.0 s, you return your attention to the road. On the graph below represent the distance you traveled, while you weren't really paying attention to your driving. What is this distance? 5. Connie flew from Phoenix to Flagstaff, a distance of 180 miles at a constant speed of 180 mph. She then returned at a constant speed of 90. mph. What was her: a. trip distance? c. average speed? b. displacement? d. average velocity?

3 6. From the given graph in each of the sets below, sketch the shape of the corresponding graphs. 7. Tommy's red Corvette can go from rest to 25 m/s ( 60mph) in 10. seconds. The car's velocity changes at a constant rate. a. Draw a motion map to represent the motion of the Corvette during the 10 s. b. Construct a quantitative velocity vs time graph to represent the motion of the car.

4 c. What is the acceleration of the car? Show work; use labels. d. How far will the car travel in these 10. seconds? e. How fast will the car be going 3.0 seconds after it starts? For all questions, assume air resistance and friction to be negligible forces unless otherwise specified. 8. If a freely falling object were somehow equipped with a speedometer, its speed would increase each second by about a. 2 m/s. b. 5 m/s. c. 10. m/s. d. a variable amount. e. It depends on its initial speed. 9. If a freely falling object were somehow equipped with an odometer to measure the distance it travels, then the distance it travels each succeeding second would be a. less than the previous second. b. greater than the previous second. c. the same. d. The distance cannot be predicted. 10. A projectile is launched straight upwards at 45 m/s. Three seonds later, its velocity is a. 75 m/s b. 30 m/s c. 15 m/s d. zero 11. Starting from rest, a freely-falling object will fall in 10. seconds, a distance of about a. 10. m. b m. c m. d m. e. more than 1000.m. 12. A projectile is fired straight up at a speed of 200. m/s. When the projectile returns to its starting position, its speed is a. more than 200. m/s. b. less than 200. m/s. c m/s. d. It depends on how long it takes to return. 13. When a rock thrown straight upward gets to the exact top of its path, the magnitude of its

5 a. velocity is zero and its acceleration is zero. b. velocity is about 10 m/s and its acceleration is zero. c. velocity is zero and its acceleration is about 10 m/s 2. d. velocity is about 10 m/s and its acceleration is about 10 m/s 2. Questions 14 and 15 refer to the situation and diagram described below. Two spheres of equal mass, A and B, are projected off the edge of a 1.0 m bench. Sphere A has a horizontal velocity of 10 m/s and sphere B has a horizontal velocity of 5 m/s. 14. If both spheres leave the edge of the table at the same instant, sphere A will land a. at some time after sphere B. b. at the same time as sphere B. c. at some time before sphere B. d. There is not enough information to decide. 15. If both spheres leave the edge of the table at the same instant, sphere A hits the floor at the spot marked X. Sphere B will hit the floor a. at some point between the edge of the table and X. b. at some point past X. c. at the same distance from the table as X. d. there is not enough information to decide. 16. A diver leaps up and out off the edge of a cliff with an initial velocity of 8.0 m/s at a 30 angle from the horizontal. The cliff is 12 m above the water a. Determine the x and y components of the jumper's initial velocity. b. Determine how long the diver is in the air. c. How far from the base of the cliff did the diver enter the water?