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Chapter 12 Lesson 2 Newton’s Laws (1st and 2nd) Newton’s Video I. Famous Scientists A. Aristotle – Greek 1. force is required to keep an object moving at a constant speed. True / False B. Galileo – Italian 1. moving objects, without gravity, would continue to move. True / False C. Newton 1. 1665 – Years of work 2. Book Principia D. Newton’s 1st Law 1. Def – an object in motion stays in motion. An object at rest will stay at rest. 2. Ex: Car crash (pg. 364) 3. Ex: Ball sitting on ground 4. Ex: Curved road…what happens? E. Newton’s 2nd Law 1. Def – A force that acts on an object causes the object to move in the direction of the force. a. Must be unbalanced 2. Rocket Demo a. Using arrows to represent forces, draw a model describing the Rocket Demo. b. Hypothesize: What will happen when I add 100 grams of mass to the rocket? 3. Formula Force = mass x acceleration F=ma Force = Newton’s 4. How much force would it take to accelerate a motorcycle to 5 m/s2 with a 200 kg motorcycle and a 75 kg rider? (F = m x a) F=? M = 200 + 75 = 275 a = 5 m/s2 F = 275 kg x 5 m/s2 = 1375 Newton’s In Class Problems… 1. How much force is needed to accelerate a car at 8 m/s2 if the mass of the car is 1000 kg? 8,000 Newton’s 2. How much force is needed to accelerate a dirt bike 5 m/s2 if the bike has a mass of 50 kg and the rider has a mass of 60,000 grams? 550 Newton’s 3. Make up your own story problem with an answer for class tomorrow.