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Presentation transcript:

Only write what is in underlined Notes Only write what is in underlined

Momentum = Mass X Velocity The SI unit for mass = kg. The SI unit for velocity = m/s. The SI unit for momentum = kg x m/s.

Momentum is “conserved” – which means it is not lost (it transfers). Ex: Newton’s Cradle Momentum transfers from one object into the other object that it runs/slams/crashes into.

This is Newton’s Cradle It demonstrates momentum being conserved This is Newton’s Cradle It demonstrates momentum being conserved. It also demonstrates potential and kinetic energy – which is our second set of notes today – following momentum

Sometimes momentum depends on mass. A car has more mass than a bicycle. So, if they were both moving at 30 mph, then the momentum of the car would be greater. A car colliding at 30 mph does causes more damage than the bicycle colliding at 30 mph Momentum is basically “bashing power”.

momentum bouncy balls bill nye momentum example

ALSO: Stopping distance is affected by momentum The more massive the car, the more distance the car is needed to come to a stop. A big semi will need more distance to come to a stop compared to a regular little car.

It’s complicated… angular momentum Ordinary momentum is a measure of an object's tendency to move at constant speed along a straight path. Then there’s angular momentum – very complicated. (that “spinny” bike tire) In astronomy most things move in curved paths and have angular momentum. Angular momentum measures an object's tendency to continue to spin

All moving objects have momentum. (all moving things have velocity) (0 velocity = 0 momentum) When an object speeds up, it gains momentum – because velocity is increasing.

Momentum can be transferred, lost, or gained. A snowboarder gets stuck on a flat part of the mountain. An ice skater is spinning and tightens her spin and begins to spin faster Hitting a cue ball into another pool ball. A skateboarder going down hill Lost Gained Transferred gained

Calculate Momentum (MxV) A 200 lb football player running 5 mph vs A 300 lb football player running 2 mph What would happen if they were running towards eachother? (who would knock down who) 1000 lb-mph 600 lb-mph The 200 lb player would knock over the 300 lb player

Momentum videos http://www.youtube.com/watch?v=Jnj8mc04r9E&list=PL3E788EDA794CCE7B&index=6&feature=plpp_video http://www.youtube.com/watch?v=BiLq5Gnpo8Q&list=PL3E788EDA794CCE7B&index=17&feature=plpp_video http://www.youtube.com/watch?v=OuA-znVMY3I&list=PL3E788EDA794CCE7B&index=20&feature=plpp_video