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How do you calculate change in momentum?

How do you calculate a change in momentum?

  • I need a definition of how you would calculate a change in momentum. Thanks

  • Answer:

    In math talk, the change in momentum is dP = d(mV) = dm V + m dV = F dt; where m is the mass of the body with the momentum, V is its velocity (not speed, the vector), F is the average force acting on the body over the interval dt time. Note that dm is the change in mass. This is common in rockets where burning off the fuel reduces the mass over the burn time dt. In this case F = T the average thrust of the rocket motors. Rocketeers like to use the term "impulse" when talking about the thrust over some time interval. As you can see, a greater impulse yields a greater change in momentum and, for rocketeers, that's a good thing.

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A change in momentum would occur if the mass and or velocity changed. p = m * v

Sideburns

Momentum is p = mv. Assuming mass, m, stays constant, a change in momentum, p, is due only to change in velocity, v. So, if a body has p1 = mv1, and it has a change in velocity (it accelerates to a new velocity, v2), it'll have a new momentum, p2. The change in momentum is then p2 - p1 = mv2 - mv1

Mark Martin

Force acting x time = change in momentum Example: 2500 N x 2 secs = 5000 kg-m/s (change in momentum)

Physicsquest

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