Topic: Newton’s 3rd Law and Momentum

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Presentation transcript:

Topic: Newton’s 3rd Law and Momentum Day 5 1-10-11 Topic: Newton’s 3rd Law and Momentum Objective: I will learn to distinguish the difference between action/reaction and Momentum

Science Starter

http://www.planet-scicast.com/view_clip.cfm?cit_id=2922

Momentum m v p stands for momentum p Units for momentum kg·m/s m stand for mass (kg) v stands for velocity (m/s) p m v

Momentum Summary What is the definition of Momentum? The mass of an object multiplied by its speed or velocity. 2. Write down the equation for momentum. P=mv Write down the other 2 forms of the momentum equation. m=p/v and v=p/m 4. Write down the units of momentum. Kg·m/s

Do the following problems in your notebook (p.81) 1. You throw a basketball by exerting a force of 20 newtons. According to Newton’s third law, there is another 20-newton force created in the opposite direction. If there are two equal forces in opposite directions, how does the ball accelerate? 2. What is the momentum of a 2-kg ball traveling at 4 m/sec? 3. How fast does a 1000 kg car have to move to have a momentum of 50,000 kg-m/sec? 4. Lilly’s momentum is 110 kg-m/sec when she walks at 2 m/sec. What’s her mass? 5. Which has more momentum: a 5000-kg truck moving at 10 m/sec or a sports car with a mass of 1200 kg moving at 50 m/sec?