Test 1 -Practice (Kinematics)

Transcription

1 Name: ate: 1. car travels a distance of 98 meters in 10 seconds. What is the average speed of the car during this 10-second interval? 4.9 m/s 9.8 m/s 49 m/s 98 m/s 4. The diagram shown represents a force acting at point P. Which pair of concurrent forces would produce equilibrium when added to the force acting at point P? 2. boat initially traveling at 10 meters per second accelerates uniformly at the rate of 5.0 meters per second 2 for 10 seconds. How far does the boat travel during this time? 50 m 250 m 350 m 500 m 3. n object accelerates uniformly from rest to a speed of 50 meters per second in 5.0 seconds. The average speed of the object during the 5.0-second interval is 5.0 m/s 10 m/s 25 m/s 50 m/s 5. boat heads directly eastward across a pier at 12 meters per second. If the current in the river is flowing at 5.0 meters per second due south, what is the magnitude of the boat s resultant velocity? 7.0 m/s 8.5 m/s 13 m/s 17 m/s 6. 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 page 1

2 7. Which two graphs represent the motion of an object on which the net force is zero? 9. Which is a vector quantity? distance time speed acceleration newton force and a 4.0-newton force act concurrently on a point. In which diagram shown would the orientation of these forces produce the greatest net force on the point? 8. s shown in the diagram, an astronaut on the Moon is holding a baseball and a balloon. The astronaut releases both objects at the same time. What does the astronaut observe? [Note: The Moon has no atmosphere.] 11. rock falls freely from rest near the surface of a planet where the acceleration due to gravity is 4.0 meters per second 2. What is the speed of this rock after it falls 32 meters? The baseball falls slower than the balloon. The baseball falls faster than the balloon. The baseball and balloon fall at the same rate. The baseball and balloon remain suspended and do not fall. 8.0 m/s 16 m/s 25 m/s 32 m/s 12. n object falls freely from rest near the surface of the Earth. What is the speed of the object when it has fallen 4.9 meters from its rest position? 4.9 m/s 9.8 m/s 24 m/s 96 m/s page 2

3 13. The speed-time graph shown represents the linear motion of a cart kilogram rock and a 1.0-kilogram stone fall freely from rest from a height of 100 meters. fter they fall for 2.0 seconds, the ratio of the rock s speed to the stone s speed is 1 : 1 2 : 1 1 : 2 4 : Which pair of concurrent forces could produce a resultant force having a magnitude of 10 newtons? etermine the magnitude of the acceleration of the cart during interval [Show all calculations, including the equation and substitution with units.] 14. alculate the distance traveled by the cart during interval [Show all calculations, including the equation and substitution with units.] 15. What is the average speed of the cart during interval? 10 N, 10 N 10 N, 30 N 4.7 N, 4.7 N 4.7 N, 5.0 N 21. The diagram shows a person exerting a 300-newton force on the handle of a shovel that makes an angle of 60 with the horizontal ground. The component of the 300-newton force that acts perpendicular to the ground is approximately 16. 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? 150 N 260 N 300 N 350 N 22. What is the total displacement of a student who walks 3 blocks east, 2 blocks north, 1 block west, and then 2 blocks south? 17. In an experiment that measures how fast a student reacts, a meter stick dropped from rest falls 0.20 meter before the student catches it. The reaction time of the student is approximately 0 2 blocks east 2 blocks west 8 blocks 0.10 s 0.20 s 0.30 s 0.40 s 18. race car traveling at 10 meters per second accelerates at the rate of 1.5 meters per second 2 while traveling a distance of 600 meters. The final speed of the race car is approximately 23. baseball pitcher throws a fastball at 42 meters per second. If the batter is 18 meters from the pitcher, approximately how much time does it take for the ball to reach the batter? 1.9 s 2.3 s 0.86 s 0.43 s 1900 m/s 910 m/s 150 m/s 44 m/s page 3

4 24. The length of a high school physics classroom is probably closest to 10 2 m 10 1 m 28. s shown in the diagram, a painter climbs 7.3 meters up a vertical scaffold from to and then walks 11.0 meters from to along a level platform m 10 4 m 25. stone is dropped from a bridge 45 meters above the surface of a river. pproximately how many seconds does the stone take to reach the water s surface? 1.0 s 10 s 3.0 s 22 s 26. The displacement-time graph shown represents the motion of a cart along a straight line. uring which interval was the cart accelerating? The magnitude of the painter s total displacement while moving from to is 3.7 m 13.2 m 18.3 m 25.6 m 29. 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 E newton force acts on point P, as shown in the diagram. The magnitude of the vertical component of this force is approximately 30 N 50 N 71 N 87 N page 4

5 30. ase your answer(s) to the following question(s) on the information and data table below. car is traveling due north at 24.0 meters per second when the driver sees an obstruction on the highway. The data table shows the velocity of the car at 1.0-second intervals as it is brought to rest on the straight, level highway. Time (s) Velocity (m/s) Using the information in the data table, construct a graph on the grid, following the directions below. Plot the data points for velocity versus time. 31. raw the best-fit line. 32. Using your graph, determine the acceleration of the car. [Show all calculations, including the equation and substitution with units.] page 5

6 Problem-ttic format version c Educide Software Licensed for use by phelipedfernandes@gmail.com Terms of Use at 10/7/ a = v 40 m/s t = 20 s = 2 m/s v = s t = 40 m/s = s 20 s = 800 m v f + v i 2 = 40 ms + 0 ms 2 = 20 m/s

7 Teacher s Key Page m/s 2