“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.