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Impulse & Momentum

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.

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Impulse & Momentum

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  1. Impulse & Momentum Chapter 9

  2. 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

  3. 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

  4. Rearrange

  5. Impulse • The product of the average force on the object and the time interval over which the force acts • Impulse=FΔt

  6. Momentum • The product of mass and velocity • r=mv • r is a Greek letter representing momentum • Units kilogram.meter/second

  7. Impulse-Momentum Theorem • The impulse on an object equals the change in momentum of the object

  8. 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.

  9. 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.

  10. 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?

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