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Momentum is mass * constant velocity, impulse involves imposing a force (either for or against) for a specified time , altering the velocity (and therefore, momentum)

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Example. a 10 kg mass (m) @ 10 metres / second, has an impulse of 100 newtons / 10 seconds (t) applied in the direction of motion.

Find the velocity change / new velocity / initial and final momentum

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From f = m * a, but a = velocity change (vc) / time (t)

So>

f = m * (vc / t)

Then>

vc = t * (f / m) = 10 * 10 = 100 metres / sec velocity change (+ in this case)

so, velocity is now 10 + 100 = 110 metres / sec (constant velocity)

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initial momentum (p) = 10 * 10 = 100

momentum (after impulse) (p) = 10 * 110 = 1100

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Alternatively, to calculate final velocity after impulse

First, find acceleration rate from a = f / m

you know the impulse time, you know the initial velocity.

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Use v = u + (a*t)

v = 10 + (10 * 10)

v = 110 metres per second

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12y ago
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12y ago

F= m(v-u)/t or Ft= mv-mu... Impulse. Impulse= change in momentum. The unit of impulse is the newton second (Ns). Since this quantity is equal to change in momentum it means that momentum can also be expressed in Ns. Impulse=Ft=change in momentum.

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Q: How are momentum and impulse related?
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