Name:_________________________
Date:___________________
Pd. ___________
Homework: Conservation of Momentum
1. Each croquet ball in a set has a mass of 0.50kg. The green ball, traveling at 12.0 m/s, strikes the blue ball, which is
at rest. Assuming that all collisions are head-on, find the final speed of the blue ball in each of the following
situations:
a. The green ball stops moving after it strikes the blue ball.
Givens:
Equation:
Calculations:
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Answer:
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)
(
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)
[don’t forget your units!]
b. The green ball continues moving after the collisions at 2.4 m/s in the same direction.
Givens:
Equation:
Calculations:
(
Answer:
)(
)
(
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)
(
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)
[don’t forget your units!]
c. The green ball continues moving after the collision at 0.3m/s in the same direction.
d. Givens:
Equation:
Calculations:
(
Answer:
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)
(
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)
(
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)
[don’t forget your units!]
2. A 65.0kg ice skater moving forward with a velocity of 2.50m/s throws a 0.150kg snowball forward with a velocity
of 32.0m/s.
a. What is the velocity of the ice skater after throwing the snowball? Disregard the friction between the
skates and the ice.
Givens:
Equation:
Calculations:
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)
(
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(
Answer:
(
)
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)
(
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(
)
[don’t forget your units!]
)(
)
b. A second skater initially at rest with a mass of 60.0kg catches the snowball. What is the velocity of the
second skater after catching the snowball?
Givens:
Equation:
Calculations:
(
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(
Answer:
(
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)( )
(
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)
[don’t forget your units!]