WHICH LAW? We're told that Sir Isaac Newton discovered some things about motion when an apple dropped on his head. Whatever "force" was behind his discoveries, we have benefited from his discoveries. Here are his three laws of motion. You should be familiar with them. Fill in the missing words in each of the three laws. Then tell which law fits each example below. Which law? First, Second, or Third? 1. 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. 2. As the fuel in a rocket ignites, the force of the gas expansion and explosion pushes out the back of the rocket and pushes the NEWTON'S FIRST LAW OF MOTION: rocket forward. stays at An object at 3. When you are standing up in a subway at a or an object that is train, and the train suddenly stops, your keeps body continues to go forward. in a straight unless another 4. After you start up your motorbike, as you moving at that give it more gas, it goes faster. acts on it. 5. A pitched baseball goes faster than one that is gently thrown. 6. A swimmer pushes water back with her arms, but her body moves forward. NEWTON'S SECOND LAW OF MOTION: The amount of_ 7. As an ice skater pushes harder with his leg muscles, he begins to move faster. make an object change its needed to depends on the 8. When Bobby, age 5, and his dad are skipping pebbles on the pond, the and the of the object pebbles that Bobby's dad throws go required. farther and faster than his. 9. When you paddle a canoe, the canoe goes forward. 10. A little girl who has been pulling a NEWTON'S THIRD LAW OF MOTION: sled behind her in the snow is crying because when she stopped to tie her (or force), there is an hat on, the sled kept moving and hit For every action (or force). her in the back of her legs. and