# Momentum?!

Can anyone please explain how to calculate momentum and how to work out the velocity for collisions and/or when something recoils (like a cannon)? I'm so confused about this- thank you:)

Posted Mon 21st May, 2012 @ 17:46 by AmyPond

I'm sorry i can't remember the formula for momentum, but in a collision, or when something recoils, the momentum must equal the same, as in the momentum one way must be the same as the other. For example you said cannon. The shot would equal the cannon recoiling, because the object moving forward despite being smaller is faster.

Thank you:)

Answered Mon 21st May, 2012 @ 18:22 by AmyPond

Momentum formula is P= MV
P = Momentum
M = Mass
V = Velocity

Conservation of energy theory states what Maddie said in the above comments :)

Answered Tue 22nd May, 2012 @ 23:19 by Sophie :o)

If you have two particles colliding, then momentum can be calculated using the following formula.

where M1/2 = Mass of Particle 1 or 2

U1/2 = initial velocity of particle 1 or 2

V1/2 = Final velocity of particle 1 or 2

the formula is

(M1*U1) + (M2*U2) = (M1*V1) + (M2*V2)

Answered Wed 23rd May, 2012 @ 10:42 by Josh Whittington

ah ok- I think I get it:) Thank you everyone! Freaking out about tomorrow though...got physics and english literature on the same day:\

Answered Wed 23rd May, 2012 @ 18:17 by AmyPond