Momentum
• Momentum is "mass in motion."
• All objects have mass; so if an object
is moving, then it has momentum.
• Momentum depends upon mass and
velocity.
• Momentum is a vector. (Has direction)
• Momentum = mass • velocity
p=m•v
units kg m/s
Momentum
Answer the following
What is momentum?
What variables are involved in your definition? How are they
related?
Could the butterfly and the 18-wheeler ever have the same
momentum? Why or why not?
Momentum
Stop @ (2min mark)
Impulse
Changing Newton’s 2
nd
F=ma
F = m (Vf – Vi)
t
F t = m (Vf – Vi)
Law
Notes: Impulse
This equation is called the
Impulse Momentum Equation
but it should be called
Impulse CHANGE in Momentum
Impulse = force·time
Impulse = mass·∆velocity
Impulse = change in momentum
J = F t= m(Vf – Vi )= Δp
J = impulse (N·s) m =mass (kg)
v = velocity (m/s) F = force (N)
t = time (s)
p = momentum (kg·m/s)
IMPULSE is the product of a FORCE and
the TIME over which it acts.
impulse = F t
A CHANGE IN MOMENTUM is simply
the difference between the Final
Momentum and the Initial Momentum
change in momentum = m (Vf – Vi)
Crash Videos
Honda Goldwing AirBag
AirBag Vest Saves Life
Bicycle Safety Helmet
Safety Sphere
Tesla Crash Test
Crash Video
Bozeman Science Impulse Video
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Take notes in your composition book
and work out Car Crash practice
problem by pausing the video before
he shows the answer.
Write down a small summary about
the main idea of the video