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Rotational Inertia and Angular Momentum
Inertia ,[object Object],[object Object]
Rotational Inertia ,[object Object],[object Object],vs vs
Why do some racing bicycles have solid wheels? ,[object Object],[object Object],vs
Which has more rotational inertia? ,[object Object],[object Object]
Rotational Inertia Application ,[object Object],[object Object]
Rotational Inertia Wrap Up  ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Force vs. Torque ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Torque
Loosening a bolt ,[object Object],[object Object],Some torque more torque,  ____________ Even more torque,  ____________
Torque & dragsters ,[object Object]
Torque and Balancing ,[object Object],[object Object]
Torque Practice Problem ,[object Object]
Angular Momentum ,[object Object],[object Object]
Conservation of Angular Momentum Why do ice skaters spin so much faster when they bring their arms close to their bodies?
Conservation of Angular Momentum To understand why ice skaters, divers, & gymnasts spin faster when they bring their bodies in we must discuss the Conservation of Angular Momentum.
Law of Conservation of Angular Momentum ,[object Object],Angular Momentum Before = Angular Momentum After Rot. Inertia  x  Rot. Velocity   =  Rot. Inertia  x  Rot. Velocity   (before)     (after)
The Angular Momentum for both is the same because  they have to be the same…IT’S A LAW! big rotational inertia small rotational inertia small rotational velocity big rotational velocity
Angular Momentum and Vectors ,[object Object],Angular Momentum like linear momentum is a vector.   Direction is important!
The Direction of Angular Momentum Because the direction of something rotating is hard to determine, physicists say that the direction of angular momentum is in the plane of the rotation. If this wheel was rotating, we would say its angular momentum is pointed in this direction. So it would want to stay rotating in that direction.
Examples of Angular Momentum So next time you play: Remember you are just conserving angular momentum. - Football - Frisbee - Ride your bike

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Rotation powerpoint

  • 1. Rotational Inertia and Angular Momentum
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 10.
  • 11.
  • 12.
  • 13.
  • 14.
  • 15. Conservation of Angular Momentum Why do ice skaters spin so much faster when they bring their arms close to their bodies?
  • 16. Conservation of Angular Momentum To understand why ice skaters, divers, & gymnasts spin faster when they bring their bodies in we must discuss the Conservation of Angular Momentum.
  • 17.
  • 18. The Angular Momentum for both is the same because they have to be the same…IT’S A LAW! big rotational inertia small rotational inertia small rotational velocity big rotational velocity
  • 19.
  • 20. The Direction of Angular Momentum Because the direction of something rotating is hard to determine, physicists say that the direction of angular momentum is in the plane of the rotation. If this wheel was rotating, we would say its angular momentum is pointed in this direction. So it would want to stay rotating in that direction.
  • 21. Examples of Angular Momentum So next time you play: Remember you are just conserving angular momentum. - Football - Frisbee - Ride your bike