Science 20 Physics Review Name 1. Which velocity-time graph below best represents the motion of an object sliding down a frictionless slope? a. b. c. d. Numerical response 1 The roadrunner is moving at 33.0 m/s west. The time required for him to travel 480 m is s. Record your three-significant digit answer. Numerical response 2 A rock is shot straight up at 18.4 m/s from the surface of Earth. After 2.00 s, the rock will be m above the surface. Record your three-significant digit answer.
Numerical response 3 An object falls from rest for a distance of 27.0 m. The time needed to fall this distance is s. Round and record your three-significant digit answer. Numerical response 4 An object is moving at 4.66 m/s when it accelerates at 5.66 m/s 2 for a period of 2.35 s. The distance it moves in this time is m. Round and record your three-significant digit answer. 2. Unless acted on by an external net force, an object will stay at rest or a. come to rest. b. accelerate at a constant rate. c. slow down from a given speed. d. continue to move in a straight line at a constant speed. 3. Determine the net force required to accelerate a 25.1 kg object at 5.50 m/s 2. a. 384 N b. 138 N c. 108 N d. 25.1 N 4. A 1.50 x 10 3 kg car moving at 11.0 m/s collides with a wall as shown. The car bounces off the wall with a speed of 1.3 m/s. If the collision lasts for 1.7 s, what magnitude of force does the wall apply to the car during the collision? a. 8.6 x 10 3 N b. 1.1 x 10 4 N c. 1.5 x 10 4 N d. 1.8 x 10 4 N Numerical response 5 Two balls collide. A red ball (m = 1.10 kg) was moving at 12.0 m/s when it hit a blue ball (m = 1.30 kg) moving in the opposite direction at an unknown speed. Both balls come to a stop in 0.430 s. The magnitude of the force acting on the blue ball is N. Record your three significant digit answer.
5. A ball tied to a string is spun in a horizontal circle. The string breaks when the ball is at the position indicated. Top view What path will the ball follow? a. P b. Q c. R d. S 6. A constant force is applied to an object on a frictionless surface as shown in the diagram below. The object has a. constant velocity b. constant momentum c. constant acceleration d. constant speed Numerical response 6 A Starfleet science officer (mass = 68.3 kg) is standing on the surface of Bagan s World, a strangely boring planet populated by biologists. The planet exerts a force of 489 N on her. The acceleration due to gravity on the surface of the planet is m/s 2. Record your three-significant digit answer.
7. The diagram below shows two carts on a horizontal frictionless surface being pushed apart when a compressed spring attached to one of the carts is released. Cart A has a mass of 3.0 kg and cart B has a mass of 5.0 kg. The speed of cart A is 0.33 m/s after the spring is released. If the carts are originally at rest, what is the speed of cart B after the spring is released? a. 0.12 m/s b. 0.33 m/s c. 0.20 m/s d. 0.55 m/s Use the following information to answer the next three questions. Each question has only three choices. A fast moving bus and a slow moving bug have a head-on collision. The unlucky bug splatters all over the windshield. 8. During the collision, the greater force acts on the a. bug b. car c. same for both 9. During the collision, the greater impulse acts on the a. bug b. car c. same for both 10. During the collision, the greater change in momentum acts on the a. bug b. car c. same for both
11. A 140 kg football player is running north at 3.00 m/s when he collides with a 90.0 kg player running south at 7.50 m/s. If the two remain together for a brief moment, what will the velocity of the players be? a. 1.11 m/s north b. 4.76 m/s north c. 4.76 m/s south d. 1.11 m/s south Numerical response 7 A 2.0 kg melon is placed on top of a bald man s head (friction is very low). His wife fires a 0.050 kg arrow at a speed of 30 m/s. The arrow passes through the melon and comes out the other side at 17 m/s. The speed of the melon as it flies off the head of the man is m/s. Round and record your two significant digit answer. 12. A 3.0-kilogram steel block is at rest on a frictionless horizontal surface. A 1.0- kilogram lump of clay is propelled horizontally at 6.0 m/s toward the block as shown in the diagram below. The clay sticks onto the steel block. Determine the magnitude of the velocity of the objects after the collision. a. 1.5m/s b. 2.0 m/s c. 3.0 m/s d. 6.0 m/s 13. A 0.15 kilogram baseball moving at 20 m/s is stopped by a catcher in 0.010 second. The magnitude of the force stopping the ball is a. 3.0 10 2 N b. 3.0 10 1 N c. 3.0 N d. 3.0 10 2 N
Key 1. C NR 1 14.5 NR 2 17.2 NR3 2.35 NR 4 26.6 2. D 3. B 4. B NR 5 30.7 5. C 6. D NR 6 7.16 7. C 8. C 9. C 10. C 11. D NR 7 0.33 12. A 13. D