Momentum Main Page

Any object that has both mass and velocity has momentum.  A thrown baseball has momentum.  An automobile traveling down the highway has momentum.

Momentum is the product of mass times velocity.  It is said that Sir. Isaac Newton referred to this as the quantity of motion.

If there is no force acting on a body then the body remains in its current state.  The momentum of the body must be conserved.

Start with Newton's second law of motion, F = ma.

F = ma
F = m(Δv/Δt)
FΔt = mΔv

FΔt is called Impulse and has units of N-s
mΔv is called momentum and has units of kg-m/s

Therefore 1N-s = 1 kg-m/s

FΔt = mΔv but  mΔv = Δp so Impulse is the same as change in momentum.