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##### Impulse & Momentum

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**Impulse & Momentum**Chapter 9**Playing Baseball**• Explain what happens to the baseball when the batter hits the ball • What happens to the bat? • Explain what happens when the outfielder catches the ball**Impulse & Momentum**• Graph on page 230 shows how the force changes with time as the bat and ball are in contact. • Check out the time. 3 ms • Newton’s 2nd law states that a net force causes an acceleration**Impulse**• The product of the average force on the object and the time interval over which the force acts • Impulse=FΔt**Momentum**• The product of mass and velocity • r=mv • r is a Greek letter representing momentum • Units kilogram.meter/second**Impulse-Momentum Theorem**• The impulse on an object equals the change in momentum of the object**Using the Impulse-Momentum Theorem**• Remember that velocity is a vector quantity so that make momentum a vector quantity. • A baseball comes into the bat with a positive velocity and leaves with a negative velocity.**Using the Impulse-Momentum Theorem to Save Lives**• How do you reduce the sting in catching a ball? • How can you catch an egg in a sheet without the egg breaking? • Explain with the Impulse-Momentum Theorem why air bags save lives.**How do you reduce the sting in catching a ball?**• How can you catch an egg in a sheet without the egg breaking? • How could the force of air bags be reduced?