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Impulse and Momentum

Impulse and Momentum. Momentum. “The change of motion is ever proportional to the motive force impressed; and is made in the direction of the right [straight] line in which that force is impressed” Sir Isaac Newton. What Newton called “motion” translates into “moving inertia”.

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Impulse and Momentum

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  1. Impulse and Momentum

  2. Momentum “The change of motion is ever proportional to the motive force impressed; and is made in the direction of the right [straight] line in which that force is impressed” Sir Isaac Newton What Newton called “motion” translates into “moving inertia” Today the concept of moving inertia is called momentum which is define as the product of mass and velocity Momentum is a vector quantity SI unit of momentum

  3. average or constant force impulse momentum change Impulse and Momentum Newton’s 2nd Law was written in terms of momentum and force Impulse causes a change of momentum for any object; this is analogous to work causes a change of energy for any object Impulse is a vector quantity SI unit of impulse

  4. Impulse of Collisions Momentum decreased by a small force over a long time Momentum decreased by a large force over a short time

  5. Impulse of Sports A boxer who “rolls with the punch” will experience less force In what other sports should you extend the impulse time for safety?

  6. Impulse of Sports In many sports you are taught to “follow through”. Why? As you “follow through” the time of contact with the ball is increased, so the amount of momentum change is also increased. More momentum….more speed (and/or distance)!

  7. Impulse of Sports

  8. Impulse of Sports Example: You pull out your 9 iron for a 150 yard approach shot to the 18th green at Augusta National. You apply an average force of 3000 N to a 47 gram Titleist Professional golf ball, giving it a speed of 75 m/s off the clubhead. How long is the club in contact with the golf ball?

  9. Impulse of Spacecraft Example: On September 12, 1966, a Gemini spacecraft met and docked with an orbiting Agena launch vehicle. NASA decided to determine the mass of the Agena. While coupled Gemini's motor was fired, exerting a constant thrust of 890 N for 7.0 s. As a result, the Gemini-Agena sped up by 0.93 m/s. Assuming Gemini's mass is a constant 3400 kg, calculate the mass of the Agena.

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