Penny & Feather

Purpose:
To observe that the acceleration due to gravity is the same for all objects in free fall.

Materials:
- pennies
- feathers
- beaker with magnet sets
- penny and feather tubes
- vacuum pump

Procedure:
*Drop a penny & feather in a large transparent tube, first full of air and then with air evacuated.
1. Attach Vacuum pump to base of tube. Place magnet plates in position on top of the tube's cap and hang feather and "coin" under each magnet set.
2. Place cap on top of tube taking care not to catch any feather bits between cap & tube.
3. Evacuate tube of air. (vacuum pump will take tube down to 27-28" Hg)
4. Close valve at base of tube & turn off vacuum pump.
5. Remove one magnet set at a time for students to carefully observe the penny and feather's fall.


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