1/19/11 Day 8
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1/19/11 Day 8TOPIC: Conservation of Momentum Lab
OBJECTIVE: I will calculate momentum before and after an elastic collision
STARTER: Copy the following Conservation of Momentum equation.
Momentum before = Momentum after
m1v1+ m2v2 = m1v1 + m2v2
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Table I : Collision DataMass
Of
Target
Car
(kg)
Mass
Of
Rolling
Car
(kg)
Rolling car
Before collision
Rolling car after collision
Target car after collision
Photo
Gate
(s)
Speed
(m/s)
.01/s
Photo
Gate
(s)
Speed
(m/s)
.01/s
Photo
Gate
(s)
Speed
(m/s)
.01/s
.102(2) .102(2) .0116 .862 0 0 .0141 .709
.102(2) .084(1) .0099 1.01 0 0 .0140 .714
.102(2) .056(0) .0080 1.25 .0533 .188 .0146 .685
COPY THE FOLLOWING DATA ON TO THE BOTTOM 3 LINES ON YOUR LAB REPORT
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Masses
Empty Car .056 Kg
Car + 1 .084Kg
Car + 2 .102Kg
Car + 3 .130Kg
Marble = .028Kg
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Ben bought 8 notebooks for $24.50. Some of the notebooks were $2.50 each, and the others were $3.25 each. If x represents the number of least expensive notebooks, which equation can be used to find the number of least expensive notebooks purchased?
A.$5.75(8 − x) = $24.50
B. $2.50(x − 8) + $3.25x = $24.50
C. $2.50x + $3.25(8 − x) = $24.50
D. $2.50x + $3.25(x − 8) = $24.50
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SolveLooking:
# of least expensive books
Given:
8 notebooks
24.50 total cost
2.50 Least expensive
3.25 Most expensive
X=least expensive
Relationship/solve:
Total cost = (#of least exp.)2.5 + (# of most exp.)3.25
(24.50) = (x)2.5 + (8-x)3.25