Enter your Name:   Enter your E-mail Address:  01. Define the following terms: a. Friction b. Kinetic friction c. Static friction 02. State Newton's three laws of motion. 03. A pilot is flying a mission to drop bombs on an enemy airfield. The plane is flying high and fast to the north, and the city is due north. Should the pilot drop the bombs before the plane is over the airfield, when the plane is over the airfield, or after the plane has passed the airfield? 04. A cruel boy has placed a mouse on a disk. He slowly starts to spin the disk, accelerating it faster and faster until the disk and mouse are both spinning around at an alarming rate. What will happen to the mouse if the boy suddenly stops the disk without touching the mouse: will the mouse continue to spin like it was before; will the mouse stop with the disk; or will the mouse start moving straight, skidding off the disk? 05. An ice cube (mass = l.0 kg) slides down an inclined serving tray with an acceleration of 4.0 meters per second squared. Ignoring friction, how much force is pulling the ice cube down the serving tray? 06. A baseball player (mass = 75 kilograms) is running north towards a base. In order to avoid being tagged by the ball, the baseball player slides into the base. If his acceleration in the slide is 5.0 meters per second squared south, what is the kinetic frictional force between the baseball player and the ground? 07. A man pushes a heavy cart. If the man exerts a force of 200 Newtons on the cart to keep it moving at a constant velocity, what is the frictional force between the cart and the ground? Is this kinetic friction or static friction? 08. You are looking through a physicist's laboratory notebook and notice two numbers for the friction between a block of wood and a laboratory bench. The numbers are 8 Newtons and 11 Newtons. Which refers to static friction and which refers to kinetic friction? 09. A woman pulls on a stubborn dog (mass = 30 kilograms). The dog resists the pull with a force of 30 Newtons. In addition, the static friction between the dog and the ground is 20 Newtons, while the kinetic friction is 7 Newtons. How much force must the woman exert to get the dog moving? If the woman ends up dragging the dog with an acceleration of 1.0 meters per second squared to the west, what force is she pulling with? 10. When baseball players hit the ball hard enough, their bats can sometimes break. What is exerting a force on the bat, causing it to break?