“Impulse and Momentum” The Everyday Life of Impulse Introduction to Impulse

Demonstrations Balloon Throw Drunk Driver Egg Drop Dive vs. Belly Flop What 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”

Impulse Δp = pf - pi Δp = mvf - mvi Δp = FΔ t Definition Equation Definition Equation Impulse is the product of the force applied to an object and the amount of time applied Impulse is the amount of change in an objects momentum. Δp = pf - pi Δp = mvf - mvi 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.

Cushion “Sinks in” “Stretches out” “bends” or “breaks” Crumple Zone More time to change the momentum of an object means less force applied to the object. Types of Protection When the object hits … Examples   Pillow, Fun noodle, air bag Cushion “Sinks in” “Stretches out” Bungee cord Elastics Seatbelt Suspension Crumple Zone “bends” or “breaks” Jump off table Crumple zone Bed of nails

Which hurts more? When you Belly Flop? Or When you Dive? When you belly flop the water stops you in less time, which means it must apply more force. 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.

Airbags vs. Steering Wheel

The “hand chop” Brick breaking vs. Brick not breaking

Kicking a Football vs. Kicking a Rock

Bed of Nails Concrete breaking vs Bed of Nails Concrete breaking vs. Concrete not breaking (or no concrete)

Football Pads and Helmets vs. No Pads and no Helmets

Tennis Racket vs. Paddle

Crumple Zones vs. Rigid Car

Taking a Punch Being Relaxed vs. Being Tense

Brick Wall vs. Pillow

Taking a Punch Moving with the Hit vs. Not Moving with the Hit Taking a Punch Moving with the Hit vs. Not Moving with the Hit. (Gloves vs. No Gloves)

The Karate Chop Wood Breaking vs. Wood Not Breaking

Bungee Jumping Bungee Cord (Elastic) vs. Regular Rope

#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 cushion sink in time force 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. cushion For a given change in momentum, the more time applied to stop an object, the less force needed to stop it. sink in time force

#2 Answer: 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!

#2 Answer: 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 For a given change in momentum, the more time applied to stop an object, the less force needed to stop it. stretches out time force