1. The unit of force, a Newton, is equal to a. The amount of mass in an object c. kg m/s b. Mass X Velocity d. kg m/s 2

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1 Forces in Motion Test- FORM B Multiple Choice Identify the choice that best completes the statement or answers the question. 1. The unit of force, a Newton, is equal to a. The amount of mass in an object c. kg m/s b. Mass X Velocity d. kg m/s 2 2. The amount of matter in an object is called its a. inertia. c. force. b. mass. d. balance. 3. The force that pulls falling objects toward Earth is called a. gravity. c. acceleration. b. free fall. d. air resistance. 4. When the only force acting on a falling object is gravity, the object is said to be a. stationary. c. in free fall. b. decelerating. d. a projectile. 5. Air resistance is a type of a. motion. c. velocity. b. acceleration. d. friction. 6. Objects falling through air experience a type of friction called a. terminal velocity. c. inertia. b. air resistance. d. rolling friction. 7. The tendency of an object to resist change in its motion is known as a. mass. c. force. b. inertia. d. balance. 8. The greater the mass of an object, a. the easier the object starts moving. c. the more balanced it is. b. the greater its inertia. d. the more space it takes up. 9. According to Newton s third law of motion, when a hammer strikes and exerts force on a nail, the nail a. creates a friction with the hammer. c. exerts an equal force back on the hammer. b. disappears into the wood. d. moves at a constant speed. 10. How can you increase the momentum of an object? a. by decreasing its velocity c. by increasing its friction b. by increasing its mass d. by decreasing its acceleration 11. Which type of elastic force is present in the strings on a guitar? a. compression c. friction b. tension d. inertia

2 12. Which of the following examples demonstrates a compression force? a. plucking a guitar string c. squeezing a sponge b. pulling a wagon d. dropping an apple 13. A feather and a rock dropped at the same time from the same height would land at the same time when dropped a. by Galileo in Italy c. by an astronaut on the moon. b. by Newton in England. d. None of the above 14. An object is in projectile motion if a. it is thrown with a horizontal push. c. Both A and B b. it is accelerated downward by gravity. d. None of the above 15. Acceleration of an object a. decreases as the mass of the object increases. b. increases as the force on the object increases. c. Both A and B d. None of the above 16. If three balls of different materials were dropped at the same time from the same height, which would hit the ground first? (Assume there is no air resistance.) a. a tennis ball c. a solid steel ball b. a solid rubber ball d. They would all hit at the same time. 17. According to Newton s first law of motion, a moving object that is not acted on by an unbalanced force will a. remain in motion. c. transfer its energy to another object. b. eventually come to a stop. d. accelerate in the absence of friction. 18. Forces can be added together only if they are a. acting on the same object. c. unaffected by gravity. b. balanced forces. d. substantial. 19. In physical science, a push or a pull is called a(n) a. force. c. inertia. b. acceleration. d. motion. 20. What happens when two forces act in the same direction? a. They cancel each other out. b. The stronger one prevails. c. They add together. d. Their sum divided by two is the total force. 21. Balanced forces acting on an object a. always change the object s motion. b. sometimes change the object s motion. c. never change the object s motion. d. are not related to motion.

3 22. The force that one surface exerts on another when the two rub against each other is called a. friction. c. inertia. b. acceleration. d. gravity. 23. Which of the following is an example of rolling friction? a. your shoes on a sidewalk as you walk b. bike tires on the road as you ride c. a boat on the water as it sails d. two hands rubbing together 24. Which of the following is an example of increasing friction intentionally? a. waxing skis c. throwing sand on an icy driveway b. adding grease to gears on a bike d. oiling a squeaky door 25. The force of gravity on a person or object on the surface of a planet is called a. mass. c. weight. b. air resistance d. free fall. 26. Air resistance is a. sliding friction. c. fluid friction. b. rolling friction. d. static friction. 27. The amount of air resistance acting on an object depends on the object's a. size and shape. c. density and mass. b. mass and weight. d. None of the above 28. Parachutes slow skydivers to a safer terminal velocity because parachutes a. increase air resistance. c. increase gravitational pull. b. decrease air resistance. d. decrease gravitational pull. 29. An example of an object in projectile motion is a. a leaping frog. c. riding a bicycle. b. a game of billiards (pool). d. pushing a shopping cart. 30. Newton's second law of motion states that an object's acceleration a. increases as its mass decreases and as the force acting on it increases. b. decreases as its mass decreases and as the force acting on it increases. c. increases as its mass increases and as the force acting on it increases. d. decreases as its mass increases and as the force acting on it increases. 31. Use Newton's second law of motion to calculate the mass of an object when a force of 34 N accelerates the object 4 m/s/s? a kg c kg b. 8.5 kg d. 136 kg 32. How much force is needed to accelerate a 70 kg rider and her 200 kg motor scooter at 4 m/s/s? a. 270 N c. 800 N b. 280 N d. 1,080 N

4 33. Newton's third law of motion states that whenever one object exerts a force on a second object, a. the second object exerts an equal and opposite force on a third object. b. the first object is unaffected by that force. c. the second object exerts an equal and opposite force on the first object. d. the second object exerts a less powerful force on the first object. 34. Newton's third law of motion states that if a force is exerted on an object, another force occurs that a. is equal in size and opposite in direction. b. is in the same direction and size. c. is equal in speed and opposite in direction. d. is in the same direction and speed. 35. When a swimmer swims through water, a. the action force could be the swimmer's hands and feet pushing on the water. b. the reaction force could be the water pushing on the hands and feet. c. the reaction force is what moves the swimmer forward. d. All of the above 36. Action and reaction force pairs occur a. only when there is motion. c. whether there is motion or not. b. only when there is no motion. d. only when the forces are unbalanced. 37. Which of the following is an example of Newton's third law of motion? a. hitting a baseball with a bat c. Both A and B b. sitting in a chair d. none of the above Use this for the next two questions: You have four vehicles, all driving at the same velocity side-by-side on a four-lane highway. They are a fully-loaded truck, an empty truck, a midsize van, and a small car. 38. Which one has the MOST momentum? a. the fully-loaded truck c. the midsize van b. the empty truck d. the small car 39. If all the vehicles brake at the same time because there is a collision ahead, which one will come to a complete stop FIRST? a. the fully-loaded truck c. the midsize van b. the empty truck d. the small car 40. Inertia is used when explaining Newton's a. first law of motion. c. third law of motion. b. second law of motion. d. law of conservation of momentum. 41. Catapults create a. free fall. c. projectile motion. b. orbiting. d. gravitational force. 42. Which of the following will have the greatest air resistance? a. an acorn c. an 8 1/2" X 11" sheet of paper b. a crumpled-up sheet of paper d. an apple

5 43. If a car driver suddenly makes a sharp turn, the passenger slides to the side of the car because of a. inertia. c. gravity. b. free fall. d. friction. 44. The curved path traveled by a thrown baseball is known as a. orbiting. c. projectile motion. b. centripetal acceleration. d. centripetal force. 45. Which of the following has the most momentum? a. an ant moving at 1 m/s c. a cat moving at 13 m/s b. a bird flying at 4 m/s d. you riding your bike at 12 m/s 46. A plane passes over Point A with a velocity of 8000 m/s north. Forty seconds later it passes over Point B at a velocity of 10,000 m/s north. What is the planes acceleration from A to B? a. 50 m/s/s north b m/s/s north c. 50 m/s/s north d. 200 m/s/s north 47. A car travels 85 km in the first half hour of a trip. The car continues to travel for 2 more hours and travels 200 km. What was the average speed of the car for the trip? a. 39 km/h b. 95 km/h c. 114 km/h d. 285 km/h 48. What kind of line on a distance-versus-time graph indicates that the object is accelerating? a. curved b. horizontal c. diagonal d. vertical 49. What does line segment E-F represent? a. no movement b. constant speed c. a little movement d. acceleration Short Answer (BONUS 5pts) As a struggling college student you have very little money to fill your car tank with gas. Daily you commute with four other students to class. On Friday the 13 th the car you are driving runs out of gas. Is it bad luck??? Probably not. First you try to push the car with you friends in it to the closest gas station. But you find that doesn t work. Using examples from the lessons learned (Newton s Laws of Motion and how forces work) devise a plan to get the car to the next gas station. P.S. don t commit any crimes to get your car there.

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