activities:guides:rfehockey1

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===== Earth Hockey I: Instructor's Guide =====

==== Main Ideas ====

Exploration of animations of the motion of a hockey puck on a frozen Earth.

==== Students' Task ====
//Estimated Time: 40--50 minutes//

Each group should be assigned one of the animations at
[[http://www.physics.oregonstate.edu/~tevian/paradigm9/sample/hockey|here]].
The groups should discuss their animation, until they understand it.

==== Prerequisite Knowledge ====

Familiarity with Coriolis and centrifugal acceleration.

==== Props/Equipment ====

  * Computers with web access.
  * Animations available [[http://www.physics.oregonstate.edu/~tevian/paradigm9/sample/hockey|here]].

==== Wrap-Up ====

Emphasize the basic properties:

  * Centrifugal acceleration always points towards the equator.
  * Centrifugal acceleration is always present.  In particular, it causes a motionless puck to start moving.
  * Coriolis acceleration points to the right of the direction of motion in the Northern Hemisphere.
  * Coriolis acceleration is only present if the puck is moving --- and is not located at the equator.

==== Extensions ====

  * [[..:..:courses:activities:rfact:rfehockey2|Followup activity]] allowing students to construct their own examples.

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