PHY101_Chap6Fall09

# PHY101_Chap6Fall09 - Chap 6 Momentum and Collisions 6.1...

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Chap. 6. Momentum and Collisions • 6.1 Impulse – momentum theorem • In physics, it is defined as •Impulse = F · Δ t (unit: N · s) •In plain language, it is the time total of a force, it can change/move things •Remember: Work is a distance total; (W = Force X displacement)

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Baseball bat, hockey stick, ping pong racket
Average force Most of the time, the force is not constant. But you can always find an average for convenience Impulse is the area under the curve For an given impulse, you can find the average force (giving an idea what can happen during that time period)

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Momentum The linear momentum of an object of mass m moving with a velocity is defined as the product of the mass and the velocity – SI Units are kg m / s – Vector quantity, the direction of the momentum is the same as the velocity’s
A valid unit for momentum is which of the following? 1. kg m/s 2 2. kg/m 2 3. kg m/s 4. N m Qn. 1

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Qn. 2 The units of impulse are equivalent to: 1. those of energy. 2. N m. 3. kg m/s. 4. those of force.
Impulse-momentum theorem

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The most important factor is the collision time or the time it takes the person to come to a rest – This will reduce the chance of dying in a car crash Ways to increase the time – Seat belts – Air bags

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PHY101_Chap6Fall09 - Chap 6 Momentum and Collisions 6.1...

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