lab 5 - Physics 1AL Introduction ACTION AND REACTION FORCES...

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Physics 1AL ACTION AND REACTION FORCES Summer Session II 2010 1 Introduction This lab investigates the forces two objects exert on each other when they interact. For example a falling ball feels a force from the earth, and the earth feels a force from the ball. A book resting on a desk pushes down on the desk, and the desk pushes up on the book. We would like to determine if we can find general factors that determine the sizes of the forces between two objects, and if there is a general law that relates these forces. Before you begin work on this lab read sections 4.1 through 4.4 in Serway and Faughn. Pre-lab homework: 1. a.) Suppose you have a tug of war with a friend who is the same size and weight as you are. You both pull as hard as you can, but neither of you seems to be winning. You move a little one way or the other, but mostly you are just at rest (although sweating some). Compare the magnitude of the force exerted by you on your friend, with the magnitude of the force exerted by your friend on you. Are they the same or different? If they are not the same, which is larger? Why or why not? b.) Now you have a tug of war with your kid brother (who is much smaller and lighter than you). Again you both pull hard but end in a standoff with neither of you moving much. In this situation compare the magnitude of the force you exert on your brother with the magnitude of the force he exerts on you. Are they the same or different? If they are not the same, which is larger? Why or why not? c.) The next tug of war is still with your kid brother but he is now standing on his skateboard. You can now make him roll across the floor (with a constant speed) when you pull hard. In this situation compare the magnitude of the force you exert on your brother with the magnitude of the force he exerts on you. Are they the same or different? If they are not the same, which is larger? Why or why not? 2. Due to the drivers not paying attention, a small car and a big truck collide, both are initially moving at 15 mph towards each other. Compare the magnitude of the force the truck exerts on the car to the magnitude of the force the car exerts on the truck. Which force is greater? Which vehicle would you rather ride in? Describe why you made your choice. 3. A small car is pushing a larger truck that has a dead battery. The mass of the truck is twice as large as the mass of the car. At one instant of time the car and truck both have an acceleration of 2.5 m/s 2 . Which of the following statements is true? Defend your choice with an explanation using concepts associated with Newton’s Laws. a.) The car exerts a force on the truck, but the truck doesn’t exert a force on the car.
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lab 5 - Physics 1AL Introduction ACTION AND REACTION FORCES...

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