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Section 6­1.notebook
November 09, 2011
Momentum ­ a vector quantity defined as the product of an object's mass and velocity
momentum = mass and velocity
p = mv .
SI units are kilogram­meters per second (kg m/s)
Find the momentum of a 2575 kg vehicle traveling at a velocity of 32 m/s to the west.
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Section 6­1.notebook
F = ma
November 09, 2011
F = Δp
Δt
a = Δv
Δt
Impulse­Momentum Theorem
FΔt = Δp
or FΔt = Δp = mvf ­ mvi
force x time interval = change in momentum
Impulse ­ the product of the force and the time over which it acts on an object.
A 1400 kg car moving west with a velocity of 15 m/s collides with a utility pole and is brought to rest in 0.30 s. Find the magnitude of the force exerted on the car during the collision. 2
Section 6­1.notebook
November 09, 2011
Stopping times and distances depend on the impulse­momentum theorem.
FΔt = Δp
or FΔt = Δp = mvf ­ mvi
A 2250 kg car traveling west slows down uniformly from 20.0 m/s to 5.00 m/s. How long does it take to decelerate if the force on the car is 8450 N to the east? How far does the car travel during deceleration?
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