Ch 3, 6, 7

Ch 6 15) two, P - f 16) two, F - P 18) 200N 47) same, double

Ch 3, 6-7 Jeopardy Forces 1. Will a net force on an object at rest set it in motion? 2. Nt _ Law says: a  F; a  1/m; a and F 3. Force from microscopic bumps that opposes motion while sliding 4. Bob punches Billy. There is a force on 5. Approximate mass of a person that weighs 600 N yes 2 nd friction Both 60 kg

Newton’s 1 st Law 1. First to prove Earth revolves around the Sun 2. A ball on a chain is whirled. When released it will 3. Who found that a ball rolling down a ramp rolls up nearly the same height on another ramp? 4. Does the Law of Inertia apply to moving objects, objects at rest, or both? 5. If you throw an object in space, how much force is needed to keep it going? Copernicus go straight Galileo both none

Newton’s 2 nd Law 1. What does a 1 kg bag of nails weigh? 2. A 50. N & a 20. N force act in opposite directions. What is the magnitude of the net force? 3. What is the force required to accelerate a 5.0 kg mass to 2.0 m/s 2 ? 4. Acceleration of 9.8 N object pulled upward by a 12.8 N force 5. If groceries are dropped into a cart (doubling its mass), for the same push, what is the new acceleration compared to the smaller? (#) 9.8N 30.N 10.N 3m/s 2 1/2

Newton’s 3 rd Law 1. In what size groups do forces always occur? 2. Which applies a greater force on the other in a collision? truck, bike, 3. Which has the greater deceleration in a collision? 4. A 40. N book rests on a table. What is the force of the table on the book? 5. A 60. N book rests on a table. What is the force of the book on the table? pairs same bike 40.N 60.N

Miscellaneous 1. What is Force/Area? 2. Before reaching terminal velocity, the velocity increases and acceleration __ 3. Is a falling elephant or feather attracted more by the Earth or same? 4. In a vacuum does a falling elephant or feather have more acceleration or same? 5. To increase the pressure caused by the weight, make the area of contact _ pressure decreases elephant same decrease