Impulse and Momentum The Everyday Life of Impulse

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

Demonstrations What is Impulse? How do these demos all show the same concepts? • • • Balloon Throw Egg Drop Bungee 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!

Which hurts more? When you Belly Flop? Or When you Dive? View Videos on Bucci’s page on the Hope. Hs. Blue. Wave. org website! “Victor’s Belly Flop” “Victor’s Dive” “Victor’s Comments”

Impulse Definition Impulse is the amount of change in an objects momentum. Equation Δp = pf - pi Δp = mvf - mvi Definition Impulse is the product of the force applied to an object and the amount of time applied Equation 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 “Sinks in” Pillow, Fun noodle, air bag “Stretches Suspension out” Crumple “bends” or Zone “breaks” Bungee cord Elastics Seatbelt Jump off table Crumple zone Bed of nails

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

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. 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. (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 Answer: cushion The air bag is safer because it acts like a _____. Explain: According to the Impulse-Momentum Theorem For a given change in momentum, the more time applied to ______________________. stop an object, the less force needed to stop it. Support: sink in so it slows you A cushion allows you to ______, time down over more _____ before stopping you, so less force 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!

#2 Answer: It is safe to bungee jump because the suspension bungee acts like a ______. Explain: According to the Impulse-Momentum Theorem For _____________ a given change in momentum, the more time applied to stop an object, the less force ___________________. needed to stop it. Support: out slowing you A suspension systemstretches _____, down and stopping you over more ______, time force so less _______is needed to stop you!