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title description rating updated author
Stacked Ball Drop - Lessons in Conservation of Energy and Momentum

Drop a stack of balls on the floor. By carefully choosing the relative masses of the balls, it is possible to send the top ball flying many times higher than the distance it fell. Analysis of the collision offers good lessons in relative motion and the conservation of...

Average: 4.2 (61 votes)
9-Jun-2016 guy Ball Drop
Desk Chair Angular Momentum

Describes a simple demonstration of angular momentum conservation using a spinning desk chair. A short tutorial of angular momentum and angular momentum conservation is included.

Average: 4.5 (2 votes)
28-May-2015 guy
Getting to Mars the Easy Way

Two different methods of getting to Mars are proposed. A simple analysis shows that one is better than the other. The reasons for the difference are explored, yielding an insight into orbital mechanics. The topic is appropriate for any high school physics class familiar with...

Average: 4.5 (2 votes)
5-Apr-2015 gsgreenstein Mars from Hubble