CHAPTER 5 test bank physics1) Mass is a measure of how difficult it is to change the velocity of an object. Answer: TRUE 2) Force is a vector quantity.
... [Show More] Answer: TRUE 3) A force is required for an object to move. Answer: FALSE 4) An object always moves in the direction of the net force pushing on it. Answer: FALSE 5) When a ball is thrown upwards, it reaches its maximum height when the force pushing it up is equal to its weight. Answer: FALSE 6) An object is moving with constant velocity. Which of the following statements is true? A) A constant force is being applied in the direction of motion. B) There are no forces acting on the object. C) The net force on the object is zero N. D) There is no frictional force acting on the object. 7) The acceleration of an object does not have to be in the same direction as the net force applied to it. Answer: FALSE 8) An object moving along a curved path with constant speed does not have a net force acting on it. 9) When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal velocity. This means that A) the acceleration is equal to g. B) the force of air resistance is equal to zero N. C) the effect of gravity has died down. D) the force of air resistance is equal to the weight of the parachutist. 10) When a parachutist jumps from an airplane, he eventually reaches a constant speed, called the terminal velocity. This is an example of A) Newton's First Law of motion. B) Newton's Second Law of motion. C) Newton's Third Law of motion. D) All of Newton's laws apply to this situation. 11) A force of 120 N is applied to an object whose mass is 30 kg. The object's acceleration is A) 3600 m/s2 . B) 150 m/s2 . C) 4.0 m/s2 . D) 0.25 m/s2 . 14) A net force of 135 N is applied to a certain object. As a result, the object accelerates with an acceleration of 24.0 m/s2 . The mass of the object is A) 2880 kg. B) 144 kg. C) 0.200 kg. D) 5.60 kg. This study source was downloaded by 100000849816735 from CourseHero.com on 11-14-2022 16:45:34 GMT -06:00 https://www.coursehero.com/file/26336417/CHAPTER-5-test-bank-physicsdoc/ 15) A 777 aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is 430,000 N, what is the speed of the airplane 10.0 s later? A) 12.7 m/s B) 14.0 m/s C) 18.0 m/s D) 20.0 m/s 16) A 777 aircraft has a mass of 300,000 kg. At a certain instant during its landing, its speed is 27.0 m/s. If the braking force is 480,000 N, how much further does it travel along the runway before it comes to a stop? A) 40.5 m B) 142 m C) 181 m D) 228 m 17) What average net force is required to accelerate a car with a mass of 1200 kg from 0 to 27.0 m/s in 10.0 s? A) 444 N B) 3240 N C) 4360 N D) 11800 N 18) A net force of 450 N applied to a car results in the car accelerating at 0.360 m/s2 . What is the mass of the car? A) 162 kg B) 12300 kg C) 1250 kg D) 1590 kg 19) A catcher stops a ball traveling at 40 m/s in a distance of 20 cm and feels a force of 600 N against his glove. What is the mass of the ball? A) 0.15 kg B) 0.20 kg C) 0.25 kg D) 0.30 kg 20) To determine the mass of a car, a student (with a friend at the wheel) pushes the car holding a bathroom scale between himself and the car and carefully maintains a constant reading of 400 N on the scale while the car accelerates on level ground. At the conclusion of the experiment his friend reports that the car accelerated from rest to 14.0 km/hr in 12.0 s. What was the mass of the car? A) 343 kg B) 1230 kg C) 3360 kg D) 3430 kg 21) A truck is towing a car whose mass is one quarter that of the truck. The force exerted by the truck on the car is 6000 N. The force exerted by the car on the truck is A) 1500 N. B) 24000 N. C) 3000 N. D) 6000 N. 24) Two boxes, one more massive than the other, rest in contact with one another on a smooth, level floor. A horizontal force F pushes on one or the other of the boxes. The contact force between the boxes A) is larger when F is applied to the more massive box. B) is larger when F is applied to the less massive box. C) is equal in both cases. D) can be larger or smaller depending on the actual masses. This study source was downloaded by 100000849816735 from CourseHero.com on 11-14-2022 16:45:34 GMT -06:00 https://www.coursehero.com/file/26336417/CHAPTER-5-test-bank-physicsdoc/ 29) The mass of the Moon is about 1/80th of the mass of Earth. The force exerted by Earth on the Moon is about 80 times that exerted by the Moon on Earth. Answer: FALSE 30) The force you exert on Earth is insignificant compared to the force Earth exerts on you. Answer: FALSE 31) A 3.0-kg and a 5.0-kg box rest side-by-side on a smooth, level floor. A horizontal force of 32 N is applied to the 3.0-kg box pushing it against the 5.0-kg box, and, as a result, both boxes slide along the floor. How large is the contact force between the two boxes? A) 12 N B) 20 N C) 32 N D) 0 N 32) A 3.0-kg and a 5.0-kg box rest side-by-side on a smooth, level floor. A horizontal force of 32 N is applied to the 5.0-kg box pushing it against the 3.0-kg box, and, as a result, both boxes slide along the floor. How large is the contact force between the two boxes? A) 12 N B) 20 N C) 32 N D) 0 N 33) Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 5.0-kg mass, which pushes against the other two masses. What is the contact force between the 5.0-kg mass and the 3.0-kg mass? A) 0 N B) 10 N C) 25 N D) 40 N 34) Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 5.0-kg mass, which pushes against the other two masses. What is the contact force between the 3.0-kg mass and the 2.0-kg mass? A) 0 N B) 10 N C) 25 N D) 40 N 36) Three boxes rest side-by-side on a smooth, horizontal floor. Their masses are 5.0 kg, 3.0 kg, and 2.0 kg, with the 3.0-kg mass in the center. A force of 50 N pushes on the 2.0-kg mass, which pushes against the other two masses. What is the contact force between the 3.0-kg mass and the 2.0-kg mass? A) 0 N B) 10 N C) 25 N D) 40 N 37) A locomotive is pulling three wagons along a level track with a force of 100,000 N. The wagon next to the locomotive has a mass of 80,000 kg, the next one, 50,000 kg, and the last one, 70,000 kg. Neglect friction. What is the force between the 80,000-kg and 50,000-kg wagons? A) 35,000 N B) 40,000 N C) 60,000 N D) 65,000 N This study source was downloaded by 100000849816735 from CourseHero.com on 11-14-2022 16:45:34 GMT -06:00 https://www.coursehero.com/file/26336417/CHAPTER-5-test-bank-physicsdoc/ 38) A locomotive is pulling three wagons along a level track with a force of 100,000 N. The wagon next to the locomotive has a mass of 80,000 kg, the next one, 50,000 kg, and the last one, 70,000 kg. Neglect friction. What is the force between the 50,000-kg and 70,000-kg wagons? A) 35,000 N B) 40,000 N C) 60,000 N D) 65,000 N 39) A locomotive is pulling three wagons along a level track with a force of 100,000 N. The wagon next to the locomotive has a mass of 70,000 kg, the next one, 50,000 kg, and the last one, 80,000 kg. Neglect friction. What is the force between the 80,000-kg and 50,000-kg wagons? A) 35,000 N B) 40,000 N C) 60,000 N D) 65,000 N 40) A locomotive is pulling three wagons along a level track with a force of 100,000 N. The wagon next to the locomotive has a mass of 70,000 kg, the next one, 50,000 kg, and the last one, 80,000 kg. Neglect friction. What is the force between the 70,000-kg and 50,000-kg wagons? A) 35,000 N B) 40,000 N C) 60,000 N D) 65,000 N 41) A 1200-kg car is pulling a 500-kg trailer along level ground. Friction is negligible. The car accelerates with an acceleration of 1.3 m/s2 . What is the force exerted by the car on the trailer? A) 600 N B) 650 N C) 700 N D) 750 N 42) A flatbed truck is carrying a load of timber which is not tied down. The mass of the timber is 800 kg. The maximum frictional force between the truck bed and the load is 2400 N. What is the highest acceleration that the truck can have without losing its load? 43) A locomotive is pulling a number of identical wagons along a level track and accelerating. Friction is negligible. Starting from the last wagon, the ratio of the forces between adjacent wagons is A) 1:2:3:4 . . . B) 1:2:4:8 . . . C) 8 1 : 4 1 : 2 1 1: . . . D) 1:1:1:1 . . . 44) A load is being lifted by means of two cables attached to it. The first cable exerts a force of 600 N at an angle of 35° to the left of the vertical. The second cable exerts a force of 1300 N. If the load is accelerating vertically, at what angle to the right of the vertical is the second cable pulling? A) 15.4° B) 16.2° C) 67.8° D) 75.8° 45) A 50.0-kg crate is being pulled along a horizontal, smooth surface. The pulling force is 10.0 N and is directed 20.0° above the horizontal. What is the acceleration of the crate? A) 0.0684 m/s [Show Less]