Name: Section: 1 Section 1: Which picture describes Newton s Laws of Motion? 5. Newton s Law 1. Newton s Law 2. Newton s Law 6. Newton s Law 3. Newton s Law 7. Newton s Law 4. Newton s Law 8. Newton s Law
2 9. Newton s Law 14. Newton s Law Section 2: Momentum Problems 15. Which has more momentum, a 1,000 kg car moving 1 m/s or a 70 kg person sprinting at 8m/s? 10. Newton s Law 16. An official major league baseball has a mass of 0.14 kg. A pitcher throws a 40 m/s fastball which is hit by the batter straight back up the middle at a speed of 46 m/s. 11. Newton s Law 12. Newton s Law a) What is the change in momentum of the ball during the collision with the bat? b) If this collision occurs during a time of 0.012 seconds, what is the average force exerted by the bat on the ball? 17. A tennis ball may leave a top player s racket on the serve with a speed of 65.0 m/s. If the ball s mass is 0.0600 kg and it is in contact with the racket for 0.0300 s, what is the average force exerted on the ball? Would this force be enough to lift a person off the ground? 13. Newton s Law
Section 3: Multiple Choices 18. Compared to the ball on the left, the ball on the right will hit the ground. 24. What is the equation for momentum? a) ρ = m/v b) F = m x a c) ρ = m x v d) F = m//a 3 25. Static friction occurs when two objects are. a) moving against each other b) at rest c) colliding d) rolling a) first b) at the same time c) harder d) second 26. What happens to the gravitational force as objects get farther apart? a) It stays the same b) It fluctuates c) It decreases d) It increases 19. The amount of gravitational force exerted on an object is its. a) acceleration b) mass c) weight d) velocity 20. The force of gravity is exerted between Earth and an object. a) on its surface b) too close to be in free fall c) at any distance d) when it is falling 21. The rate at which an object falls depends on. a) the volume of the object b) the resistance of the wind c) the mass of the object d) the force of gravity 22. When a falling object reaches terminal velocity, the force of gravity the force of air resistance. a) equals b) is unrelated to c) is greater than d) is less than 23. What can change when momentum changes? a) neither mass nor velocity b) velocity c) mass and velocity d) mass 27. Newton's second law of motion is. a) A = f/m b) F = m/a c) F = m x a d) ρ = m x v 28. The amount of force needed to make an object change its acceleration depends on the mass of the object and force required? a) Newton s 1 st Law of Motion b) Newton s 2 nd Law of Motion c) Newton s 3 rd Law of Motion d) Law of Inertia 29. Inertia, the resistance any object has to a change in velocity is related to this law of motion? a) 3 rd Law b) 1 st Law c) 2 nd Law d) Law of Universal Gravitational Forces 30. What causes thrown objects to travel in a curved path? a) Gravity b) air resistance c) Earth's gravitational pull and the inertia of the object d) momentum 31. What causes some objects to fall slower than others? a) air resistance b) forces c) acceleration d) gravity
Section 4: Problems Directions: the following problems. 32. If the mass of a helicopter is 4,500 kg and the Net force on it is 18,000N, what is the helicopter s acceleration? 36. What is the mass of a truck if it is accelerating at a rate 250m/s 2 and hits a parked car with a force of 14,000 Newton s? 4 33. A tow truck is pulling a car. What is the car s mass if the Net force on the car is 3,000N and has an acceleration of 2.0m/s 2? 37. On Earth, what is the weight of a large-screen TV that has a mass of 75kg? 34. What is the net force on a dragster with a mass of 860 kg if its acceleration is 23.0 m/s 2? 38. Calculate the mass of a person on the planet Jupiter that has a weight of 750N and an acceleration of gravity at 2.53 m/s 2. 35. What is the acceleration of a softball if it has a mass of 0.75 kg and hits the catcher s glove with a force of 115 Newton s? 39. What is the acceleration of gravity on Planet Mars of a person with a mass of 85kg and a weight of 150N?
Section 4: Multiple Choce Directions: the following problems. 40. An example of friction is. a) a car rolling to a stop at a traffic light b) a baseball moving in a projectile motion c) a tree standing in a field d) the free fall of astronauts on the space shuttle 41. A frog leaping upward off his lily pad is pulled downward by gravity and lands on another lily pad instead of continuing on in a straight line. a) Newton s 2 nd Law on Motion b) Newton s 3 rd Law of Motion c) Newton s 1 st Law on Motion d) Gravity 48. Forces that cancel each other are called forces. a) neutral b) balanced c) inactivated d) null 49. Newton's first law of motion states that. a) an object will remain at rest or keep moving unless a force acts on it b) acceleration is calculated by dividing the force exerted on an object by the mass of the object c) when a force acts on an object, its acceleration is in the same direction as the force d) when a force is applied on an object, there is an equal force applied by the object in the opposite direction 5 42. Newton's third law of motion states that. a) an object at rest tends to stay at rest b) for every action force there is an equal and opposite reaction force c) an object in motion tends to stay in motion d) force is equal to mass times acceleration 50. The motion of the two ice skaters can be illustrated by which law?. 43. What is the friction between a rolling object and the surface it rolls on called? 1. air resistance 2. static friction 3. rolling friction 4. sliding friction 45. A snow skier slowing to a stop after skiing down a mountain is an example of friction. a) rolling b) air c) static d) sliding a) Newton s 1 st Law of Motion b) Law of Forces c) Newton s 2 nd Law of Motion d) Newton s 3 rd Law of Motion 46. A(n) is a push or a pull that one body exerts on another a) motion b) force c) velocity d) acceleration 47. The is the combination of all the forces acting on an object. a) direction of motion b) inertia c) net force d) force pair