A) more mass and more inertia C) the same as the magnitude of the rock's weight C) a man standing still on a bathroom scale
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1 1. A 15-kilogram cart is at rest on a horizontal surface. A 5-kilogram box is placed in the cart. Compared to the mass and inertia of the cart, the cart-box system has A) more mass and more inertia B) more mass and the same inertia C) the same mass and more inertia D) less mass and more inertia 2. A rock is thrown straight up into the air. At the highest point of the rock's path, the magnitude of the net force acting on the rock is A) less than the magnitude of the rock's weight, but greater than zero B) greater than the magnitude of the rock's weight C) the same as the magnitude of the rock's weight D) zero 3. Which situation represents a person in equilibrium? A) a child gaining speed while sliding down a slide B) a woman accelerating upward in an elevator C) a man standing still on a bathroom scale D) a teenager driving around a corner in his car 4. Which object has the greatest inertia? A) a kg bullet traveling at 90. m/s B) a 30.-kg child traveling at 10. m/s on her bike C) a 490-kg elephant walking with a speed of 1.0 m/s D) a 1500-kg car at rest in a parking lot 5. A number of 1.0-newton horizontal forces are exerted on a block on a frictionless, horizontal surface. Which top-view diagram shows the forces producing the greatest magnitude of acceleration of the block? A) B) C) D) 6. Which situation describes an object that has no unbalanced force acting on it? A) an apple in free fall B) a satellite orbiting Earth C) a hockey puck moving at constant velocity across ice D) a laboratory cart moving down a frictionless 30. incline 7. Which object has the greatest inertia? A) a 15-kg mass traveling at 5.0 m/s B) a 10.-kg mass traveling at 10. m/s C) a 10.-kg mass traveling at 5.0 m/s D) a 5.0-kg mass traveling at 15 m/s
2 Base your answers to questions 8 and 9 on the diagram below, which shows a 1.0-newton metal disk resting on an index card that is balanced on top of a glass. 8. When the index card is quickly pulled away from the glass in a horizontal direction, the disk falls straight down into the glass. This action is a result of the disk's A) inertia B) charge C) shape D) temperature 9. What is the net force acting on the disk? A) 1.0 N B) 2.0 N C) 0 N D) 9.8 N 10. In the diagram below, a 10.-kilogram block is at rest on a plane inclined at 15 to the horizontal. As the angle of the incline is increased to 30., the mass of the block will A) decrease B) increase C) remain the same 11. Three forces act on a box on an inclined plane as shown in the diagram below. [Vectors are not drawn to scale.] 12. What is an essential characteristic of an object in equilibrium? A) zero velocity B) zero acceleration C) zero potential energy D) zero kinetic energy 13. Two forces are applied to a 2.0-kilogram block on a frictionless horizontal surface, as shown in the diagram below. The acceleration of the block is A) 1.5 m/s 2 to the right B) 2.5 m/s 2 to the left C) 2.5 m/s 2 to the right D) 4.0 m/s 2 to the left 14. Compared to the inertia of a 0.10-kilogram steel ball, the inertia of a 0.20-kilogram Styrofoam ball is A) one-half as great B) twice as great C) the same D) four times as great If the box is at rest, the net force acting on it is equal to A) the weight B) the normal force C) friction D) zero
3 15. Which two graphs represent the motion of an object on which the net force is zero? A) B) C) D) 16. A 4.0-kilogram object is accelerated at 3.0 meters per second 2 north by an unbalanced force. The same unbalanced force acting on a 2.0-kilogram object will accelerate this object toward the north at A) 12 m/s 2 B) 6.0 m/s 2 C) 3.0 m/s 2 D) 1.5 m/s Four forces act concurrently on a block on a horizontal surface as shown in the diagram below. 18. At a certain location, a gravitational force with a magnitude of 350 newtons acts on a 70.-kilogram astronaut. What is the magnitude of the gravitational field strength at this location? A) 0.20 kg/n B) 5.0 N/kg C) 9.8 m/s 2 D) Nkg 19. On a small planet, an astronaut uses a vertical force of 175 newtons to lift an 87.5-kilogram boulder at constant velocity to a height of meter above the planet s surface. What is the magnitude of the gravitational field strength on the surface of the planet? A) N/kg B) 2.00 N/kg C) 9.81 N/kg D) 61.3 N/kg 20. A 25-newton horizontal force northward and a 35-newton horizontal force southward act concurrently on a 15-kilogram object on a frictionless surface. What is the magnitude of the object's acceleration? A) 0.67 m/s 2 B) 1.7 m/s 2 C) 2.3 m/s 2 D) 4.0 m/s A 60-kilogram student jumps down from a laboratory counter. At the instant he lands on the floor, his speed is 3 meters per second. If the student stops in 0.2 seconds, what is the average force on the student? A) N B) N C) N D) 4 N 22. A 2.0-kilogram body is initially traveling at a velocity of 40. meters per second east. If a constant force of 10. newtons due east is applied to the body for 5.0 seconds, the final speed of the body is A) 15 m/s B) 25 m/s C) 65 m/s D) 130 m/s As a result of these forces, the block A) moves at constant speed to the right B) moves at constant speed to the left C) accelerate to the right D) accelerate to the left
4 23. In the diagram below, a box is on a frictionless horizontal surface with forces F1 and F2 acting shown. If the magnitude of F1 is greater than the magnitude of F2, then the box is A) moving at constant speed in the direction of F1 B) moving at constant speed in the direction of F2 C) accelerating in the direction of F1 D) accelerating in the direction of F2 24. A series of unbalanced forces was applied to each of two blocks, A and B. The graphs below show the relationship between unbalanced force and acceleration for each block. Compared to the mass of block A, the mass of block B is A) the same B) twice as great C) half as great D) four times as great 25. Two carts, A and B. are joined by a compressed spring as shown in the diagram below. The mass of cart A is twice that of cart B. Which of the following statements is true about their change in velocity when the spring is released? A) A will have the greater change in velocity. B) B will have the greater change in velocity. C) Both carts will have the same change in velocity. D) Neither cart will experience a change in velocity. 26. Net force F causes mass m1 to accelerate at rate a. A net force of 3F causes mass m2 to accelerate at rate 2a. What is the ratio of mass m1 to mass m2? A) 1:3 B) 2:3 C) 1:2 D) 1:6 27. A horizontal force is used to pull a 5.0-kilogram cart at a constant speed of 5.0 meters per second across the floor, as shown in the diagram below. If the force of friction between the cart and the floor is 10. Newtons, the magnitude of the horizontal force along the handle of the cart is A) 5.0 N B) 10. N C) 25 N D) 50. N 28. What is the magnitude of the net force acting on a kilogram car as it accelerates from rest to a speed of 15 meters per second in 5.0 seconds? A) N B) N C) N D) N 29. A kilogram automobile in motion strikes a kilogram insect. As a result, the insect is accelerated at a rate of meters per second 2. What is the magnitude of the force the insect exerts on the car? A) N B) N C) N D) N 30. An unbalanced force of 10 Newtons acts on a 20-kilogram mass for 5 seconds. The acceleration of the mass is A) 0.5 m/s 2 B) 2 m/s 2 C) 40 m/s 2 D) 200 m/s A 160.-kilogram space vehicle is traveling along a straight line at a constant speed of 800. meters per second. The magnitude of the net force on the space vehicle is A) 0 N B) 1.60 x 10 2 N C) 8.00 x 10 2 N D) 1.28 x 10 5 N
5 32. A baseball bat exerts a force of magnitude F on a ball. If the mass of the bat is three times the mass of the ball, the magnitude of the force of the ball on the bat is A) F B) 2F C) 3F D) F/3
6 33. A kilogram boy and a 50.0-kilogram girl, each holding a spring scale, pull against each other as shown in the diagram below. The graph below shows the relationship between the magnitude of the force that the boy applies on his spring scale and time. Which graph best represents the relationship between the magnitude of the force that the girl applies on her spring scale and time?
7 A) B) C) D) 34. Earth's mass is approximately 81 times the mass of the Moon. If Earth exerts a gravitational force of magnitude F on the Moon, the magnitude of the gravitational force of the Moon on Earth is A) F B) C) 9F D) 81F 35. A high school physics student is sitting in a seat reading this question. The magnitude of the force with which the seat is pushing up on the student to support him is closest to A) 0 N B) 60 N C) 600 N D) 6,000 N 36. A mosquito flying over a highway strikes the windshield of a moving truck. Compared to the magnitude of the force of the truck on the mosquito during the collision, the magnitude of the force of the mosquito on the truck is A) smaller B) larger C) the same 37. A person kicks a 4.0-kilogram door with a 48-newton force causing the door to accelerate at 12 meters per seconds. What is the magnitude of the force exerted by the door on the person? A) 48 N B) 24 N C) 12 N D) 4.0 N 38. A 60.-kilogram adult and a 30.-kilogram child are passengers on a rotor ride at an amusement park. When the rotating hollow cylinder reaches a certain constant speed, v, the floor moves downward. Both passengers stay "pinned" against the wall of the rotor, as shown in the diagram below. The magnitude of the frictional force between the adult and the wall of the spinning rotor is F. What is the magnitude of the frictional force between the child and the wall of the spinning rotor? A) F B) 2F C) F/2 D) F/4 39. A bat applies an average force of 500 Newtons on a baseball for 0.20 second. What was the average force applied by the ball on the bat? A) 100 N B) 200 N C) 500 N D) 1,000 N
8 40. A 1-kilogram object rests on a horizontal table top. The force that the table top exerts on the object is A) 1 N B) 2 N C) 0 N D) 9.8 N 41. A student throws a 5.0-newton ball straight up. What is the net force on the ball at its maximum height? A) 0.0 N B) 5.0 N, up C) 5.0 N, down D) 9.8 N, down
9 Answer Key HW Newton's Law 1. A 2. C 3. C 4. D 5. A 6. C 7. A 8. A 9. C 10. C 11. D 12. B 13. B 14. B 15. B 16. B 17. D 18. B 19. B 20. A 21. C 22. C 23. C 24. B 25. B 26. B 27. B 28. A 29. A 30. A 31. A 32. A 33. A 34. A 35. C 36. C 37. A 38. C 39. C 40. D 41. C
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