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phy 1
momentum
mometum 2
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Cards (22)
What can forces do to an object?
Speed
up or slow down the object
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What is momentum equal to?
Mass
times
velocity
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If a two-kilo particle travels at five meters per second, what is its momentum?
10
kilogram
meters per second
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What happens to momentum when a force is applied in the direction of travel?
Momentum increases due to acceleration
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What is the new momentum of a two-kilo particle traveling at eight meters per second?
16 kilogram meters per second
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How is force calculated in relation to momentum change?
Force equals change in momentum
divided
by
time
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If the change in momentum is 6 and the time is 0.5 seconds, what is the force applied?
12
newtons
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What does mv represent in the momentum equation?
Final
momentum
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What does mu represent in the momentum equation?
Initial
momentum
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How do you calculate the force required to accelerate a 600-gram ball from rest to 14 meters per second in 0.1 seconds?
Use the
momentum change equation
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What is the initial velocity of a ball that starts from rest?
Zero
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What is the mass of a 600-gram ball in kilograms?
0.6
kilograms
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What is the final momentum of a 600-gram ball accelerating to 14 meters per second?
4 kilogram meters per second
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What is the force required to accelerate the ball in the previous question?
84
newtons
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Why is the change in momentum significant during car crashes?
It can cause injuries due to
high force
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How can the risk of injury in car crashes be reduced?
By spreading the change in
momentum
over time
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What safety features are required in cars to reduce injury risk during crashes?
Crumple zones
Seat belts
Airbags
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How do crumple zones help in a car crash?
Crumple on
impact
Increase time to lose
momentum
Reduce force experienced by occupants
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What are the functions of seat belts in a car?
Prevent
ejection
from the car
Stretch to slow down occupants gradually
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How do airbags contribute to safety in a car crash?
Compressible like a pillow
Help slow down
occupants
gradually
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What is the key principle behind safety systems like helmets and crash mats?
Increase time for
momentum
loss
Result in lower
force
and reduced harm
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What is the final takeaway from the video?
Forces
change
momentum
and affect safety
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