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).
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Ch 6 - Momentum
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.
6.2 – Conservation of Momentum
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?
6.3 – Elastic and Inelastic Collisions
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!
Speed of combined fish = 4 km/hr
Then compare the initial KE to the final KE to see how much energy was “lost”
Perfectly Inelastic Collision
Kinetic Energy NOT Conserved
Kinetic Energy Conserved