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Physics Notes 09-26-07

# Physics Notes 09-26-07 - at rest What is the total momentum...

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Physics Notes 9-26-07 -Conservation of Momentum -Newton’s 3 rd law: equal and opposite -Momentum is a vector -Momentum= mass * velocity Force sub 12 is read as Force of object 1 on object 2 -Force sub 21 = - Force sub 12 Force sub 21 *delta t =- Force sub 12 * delta t = m sub 2 * delta v sub 2 = -m sub 1 * delta v sub 1 If we define momentum as p, and p=m * v Delta p sub 2 = - delta p sub 1 Warm-Up Problem A 2.0 Kg block is moving to the right at 1.0 m/s just before it strikes and sticks to a 1.0 Kg block initially
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Unformatted text preview: at rest. What is the total momentum after the collision? Delta p sub 2 = - delta p sub 1 P sub 2(final) – p sub 2 (initial) = -(p sub 1 (final) – p sub 1 (initial)) P sub 2f + p sub 1f = p sub 1i + p sub 2 i P sub 1 I = (2.0 KG)(1.0 m/s) P sub 2 I = 0 P sub (1+2) final= (3 KG)(v sub f) P I = (2.0 KG)(1.0 m/s) + 0 = (3 KG)(x) Force * delta t is known as impulse Delta p = sigma (force * delta t) Big forcé/Short Time VS small forcé/long time...
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