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Linear Momentum
Level 3: Lesson 1
Siobhan Rigby
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A little about me: Siobhan
Rigby
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My Family is from Ireland
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I grew up in New Orleans
until Hurricane Katrina
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Then I moved to Richmond, Virginia
and I go to school at MIT in Boston
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I am in my 3rd year, studying Mechanical
Engineering with Biomedical Devices
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I play Field Hockey at
MIT
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I love to sew, tango, run, hang out
with friends and explore!
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Concept question
Use the paper provided and answer A,B, C, or D
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Which is the best football team? A B
C D
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Which is the best
Movie? A B
C D
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What is momentum?
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Equation
The linear momentum p of an object of
mass m with a velocity of v is
It is a vector and points in the same direction as
the velocity vector.
vmp
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What is a vector?
A. It has a direction
B. It has magnitude
C. It is an American candy
D. A and B are both correct
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Different vectors in Physics
Velocity
Acceleration
Momentum
All in common: Direction and magnitude
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Momentum Vector
In same direction as the velocity vector used to calculate it
It is directly proportional in magnitude to the velocity vector
If the velocity doubles- the momentum doubles
Also directly proportional in magnitude to mass
If the mass doubles- the momentum doubles
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Example 1: Which has the most
momentum?
A. A bicycle that is going 15 m/s and weighs 10kg
B. A car that is going 30m/s and weighs 1500kg
C. A tank that is going 5m/s and weighs 60000kg
D. A bullet that is going 350m/s and weighs 0,5kg
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Determine the Momentum of . . .
A. 60kg American football player moving east at
9m/s
B. 1000kg car moving north at 20 m/s
C. 40kg football player moving south at 2m/s
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A Lamborghini Gallardo has 20 000
units of momentum. What would be
the new momentum if. . .
A. The velocity was doubled (x2)
B. The velocity was tripled (x3)
C. The mass was doubled (x2) (with more
passengers)
D. Both the velocity and mass was doubled
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Conservation of
Momentum
What happens when things fall apart?
What happens when objects collide?
What happens when cars hit each other? Can they still have
momentum?
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Power of the
conservation of
momentum:
Mythbusters
https://www.youtube.com/watch?v=BiLq5Gnpo8Q
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Conservation of Momentum
This means that the vector sum of the momenta
before collision is equal to the vector sum of the
momenta of the particles afterwards
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What happens in
Space? (no gravity)
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There is still
conservation of
momentum!
https://www.youtube.com/watch?v=4IYDb6K5UF8