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Momentum

Momentum. Momentum. Momentum is “inertia” in motion The symbol for momentum is p Momentum = Mass x Velocity (kg. m/s) The formula is p = mv. Question?. If the velocity of an object is zero, what is its momentum? ZERO. Impulse. Impulse is an applied force for a given length of time.

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Momentum

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  1. Momentum

  2. Momentum • Momentum is “inertia” in motion • The symbol for momentum is p • Momentum = Mass x Velocity (kg. m/s) • The formula is p = mv

  3. Question? • If the velocity of an object is zero, what is its momentum? • ZERO

  4. Impulse • Impulse is an applied force for a given length of time. • Impulse = Force x time • Unit for impulse is N.s • Formula is J = Ft

  5. Questions? • What happens to Impulse if you increase the amount of applied force for the same duration of time? • J = Ft • Impulse gets LARGER

  6. More Questions? • What happens to Impulse if you increase the time a constant applied force acts? • J = Ft • Impulse gets LARGER

  7. Example • A .22 g bullet is given a force for a short period of time when fired from a 6 inch barrel. The same bullet is given the same force for a longer period of time if fired from a long barreled rifle. So….the bullet fired from the longer Barreled rifle will experience a larger Impulse and have a higher muzzle velocity.

  8. Impulse and Momentum • Impulse causes a change in momentum. • Ft = mv = m v • A force applied for a certain length of time will cause a change in momentum!

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