Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Suppose I have a physics simulation with a single body with three degrees of freedom (two axis and rotation). I have two impulses of equal magnitude in opposite directions. When applying these impulses in the same location, the body should not move in any way, the same if I apply them in spots that aligned in the same direction as the impulses. If I apply them outside of this axis, the object would gain momentum of some sort.

In some situations there would be a balance, in others a combination.

What is the right way of calculating the actual gain in momentum for the object? Calculating one impulse after the other would not (by what logic I use) create the right solution, as both impulses might add momentum in the same direction even if their torques might cancel one-another out.

share|cite|improve this question

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Browse other questions tagged or ask your own question.