Lab-Newtons-Third-Law.docx - Lab Newtons Third Law(27 points Objectives After you have completed this laboratory you will be able to Explain Newtons

# Lab-Newtons-Third-Law.docx - Lab Newtons Third Law(27...

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Lab: Newton’s Third Law (27 points) Objectives After you have completed this laboratory, you will be able to: Explain Newton’s third law of motion. Identify action and reaction force pairs. Draw and interpret a force diagram. Introduction Isaac Newton was one of the first major scientific contributors to the field of physics. He discovered many very important scientific laws that still hold true today. Perhaps best known are his three laws of motion. Newton also studied thermodynamics, gravitation, and astronomy. His most well-known law, the third law of motion, can be paraphrased as for every action force, there is an equal and opposite reaction force. Force diagrams can be used to keep track of the action-reaction force pairs and determine the direction of motion for the objects involved. Remember, when drawing force diagrams, an arrow is drawn for each force. The arrow points in the direction of the force and the length of the arrow shows the relative magnitude of the force. Purpose of This Lab The purpose of this lab is to use Newton’s third law of motion to identify the action-reaction force pair(s) that make(s) a “balloon rocket” travel across a room. Questions 1. A girl sits on a rock that is resting on the ground. Give the action- reaction force pairs in this scenario. (Hint: Name at least two pairs.) The girl is sitting on the rock, so she is pushing down upon it. Another force is the rock, which is resting on the ground and pushing down upon it. Page 1 of 8
2. How does Newton’s third law of motion apply to a swimmer moving forward through the water? The swimmer is pushing through the water while the water is pushing back on it. Hypothesis After reading the lab instructions but before starting the lab, record your best “educated guess” about what will happen in the experiment. Write the hypothesis as an “if-then” statement, if possible. Give your reasons and outline any assumptions that lead you to this hypothesis. Be sure to include in your hypothesis the action-reaction force pair(s) in a balloon rocket. If a balloon is launched at different inflations, the balloon with more air in it will travel farther. This is due to more force being exerted from the balloon with more air. If a balloon is launched at an upward angle and a downward angle, the test with the downward angel will travel farther due to less gravitational force slowing down the balloon. Instead it would make the balloon travel farther since a downward direction is favored by gravity.