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### 09

1. 1. 09.09.2009 When you are describing the rate that a race car goes around a track, should you use the term “ SPEED” or “ VELOCITY” to describe the motion? Quand vous décrivez-vous le taux qu'une voiture de course circule une voie, devriez-vous employer la “SPEED” de limite de la “VELOCITY” pour décrire le mouvement ? ¿Cuándo usted está describiendo la tarifa que un coche de carreras circunda una pista, debe usted utilizar la “SPEED” del término de la “VELOCITY” para describir el movimiento?
2. 2. CH. 4 Notes <ul><li>Newton’s First Law: an object at rest (0 net force) stays at rest*. Objects in motion stay in motion*. “The Law of Inertia” </li></ul><ul><li>Newton’s Second Law: Force = mass times acceleration. F=ma. </li></ul><ul><li>Newton’s Third Law: For every action, there is an equal and opposite reaction. </li></ul>
3. 3. CH.4 Notes <ul><li>The Law of Universal Gravitation </li></ul>