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“Impulse and Momentum”The Everyday Life of ImpulseIntroduction to Impulse
DemonstrationsWhat is Impulse?How do these demos all show the same concepts?
• Balloon Throw• Egg Drop• Bungee Jump• Jump off the
Table• Egg Throw• Taking a Punch
• Drunk Driver• Dive vs. Belly Flop• Airbags• Seatbelts• Padded Dashboards• Crumple Zones
They all show that the MORE TIME it takes to stop an object the LESS FORCE applied is needed to stop the object!
That’s the concept of Impulse!
Which hurts more? When you Belly Flop? Or When you Dive?
View Videos on Bucci’s page on the HopeHsBlueWave.org website!
“Victor’s Belly Flop”“Victor’s Dive”“Victor’s Comments”
ImpulseDefinition
Equation
Definition
Equation
Impulse is the amount of change in an objects momentum.
Δp = pf - pi
Δp = mvf - mvi
Impulse is the product of the force applied to an object and the amount of time applied
Δp = FΔ t
For a given change in momentum (Δp): The more time applied to stop an object, the less force needed to stop it.
For a given change in momentum…The more time the object has to stop, the less force needed to stop it.
The less time the object has to stop, the more force needed to stop it.
More time to change the momentum of an object means less force applied to the object.
Types of Protection
When the object hits …
Examples
Cushion
Suspension
Crumple Zone
“Sinks in”“Stretches out”“bends” or “breaks”
Pillow, Fun noodle, air bag
Bungee cordElasticsSeatbelt
Jump off tableCrumple zoneBed of nails
Which hurts more? When you Belly Flop? Or When you Dive?
When you dive, the water takes
more time to stop you as you sink in and move through the water.
More time to stop, less force to stop you.
When you belly flop the water stops you in less time, which means it must apply more force.
Airbags vs.
Steering Wheel
The “hand chop” Brick breaking vs. Brick not breaking
Kicking a Football vs.
Kicking a Rock
Bed of NailsConcrete breaking vs.
Concrete not breaking (or no concrete)
FootballPads and Helmets vs.
No Pads and no Helmets
Tennis Racket vs. Paddle
Crumple Zones vs. Rigid Car
Taking a PunchBeing Relaxed vs. Being Tense
Brick Wall vs. Pillow
Taking a PunchMoving with the Hit vs.
Not Moving with the Hit. (Gloves vs. No Gloves)
The Karate ChopWood Breaking vs. Wood Not Breaking
Bungee JumpingBungee Cord (Elastic) vs. Regular Rope
Answer: The air bag is safer because it acts like a __________. Explain: According to the Impulse-Momentum Theorem ___________________________________________.Support: A cushion allows you to ___________, so it slows you down over more __________ before stopping you, so less ____________ is needed to stop you.
#1
Answer: The air bag is safer because it acts like a __________. Explain: According to the Impulse-Momentum Theorem ___________________________________________.
Support: A cushion allows you to ___________, so it slows you down over more __________ before stopping you, so less ____________ is needed to stop you.
#1
forcetime
sink in
cushion
For a given change in momentum, the more time applied to stop an object, the less force needed to stop it.
#2Answer: It is safe to bungee jump because the bungee acts like a ___________.Explain: According to the Impulse-Momentum Theorem _______________________________________________________________.Support: A suspension system _________, slowing you down and stopping you over more ______, so less _______is needed to stop you!
#2Answer: It is safe to bungee jump because the bungee acts like a ___________.Explain: According to the Impulse-Momentum Theorem _______________________________________________________________.
Support: A suspension system _________, slowing you down and stopping you over more ______, so less _______is needed to stop you!
suspension
stretches out
timeforce
For a given change in momentum, the more time applied to stop an object, the less force needed to stop it.