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

==== Main Ideas ====

Visually explore the effects of Coriolis and centrifugal acceleration.

==== Students' Task ====
//Estimated Time: 45--60 minutes//

Work through the Maple worksheet:
  * Make sure you understand the default pictures.
  * Try your own initial configurations.  Compare different values of the angular velocity (including negative).
  * Try to produce a boomerang, that is a configuration which returns to its
initial position as seen by the rotating observer.
  * Try to mimic the animation you worked on earlier.

==== Prerequisite Knowledge ====

  * [[..:..:courses:activities:rfact:rfehockey1|Previous activity]] investigating particular examples.

==== Props/Equipment ====

  * [[:Props:start#maple|Computers with Maple]]  


==== Activity: Student Conversations ====

  * Students may be confused about the role of the various parameters.
  * Students may need to change the viewpoint of their Maple animation in order to obtain a picture which looks like their example from the previous activity.

==== Activity: Wrap-up ====

  * Have students discuss their attempts to model boomerangs (and possibly loops and right angles).
  * Ask students to share their constructed model, and to discuss why it was chosen.

==== Extensions ====

  * Are there trajectories with multiple loops?
  * Are there trajectories which loop forever?