Ch 6 - Momentum. What is momentum?. Momentum = a vector quantity defined as the product of an object’s mass and velocity p = mv (momentum = mass x velocity) SI Unit = kgm/s (kilogram meter per second).
FΔt = Δp = mvf – mvi
Impulse = change in momentum =
final momentum – initial momentum
A 1400kg car moving westward with a velocity of 15 m/s collides with a utility pole and is brought to rest in 0.30s. Find the magnitude of the force exerted on the car during the collision.
A 76kg boater, initially at rest in a stationary 45kg boat, steps out of the boat and onto the dock. If the boater moves out of the boat with a velocity of 2.5 m/s to the right, what is the final velocity of the boat?
NOTE: You will get the same results using the equation we already learned for conservation of momentum. This just reminds you that the masses stuck together!
Then compare the initial KE to the final KE to see how much energy was “lost”