A penny and a feather fall with same acceleration in a vacuum.
Acceleration due to gravity really is the same for a feather and a penny if there is no air drag!
NCEA & Science Curriculum
SCI 1.1, PHYS 2.4
Next evacuate the tube with the pump vented to a fume hood and repeat. The penny and feather will fall together!
The mechanical pump should not be vented to a fume hood as oil droplets are unhealthy. Hold on to the hose when flipping the tube! The hose swings around and can injure someone.
Individual teachers are responsible for safety in their own classes. Even familiar demonstrations should be practised and safety-checked by individual teachers before they are used in a classroom.
- Video analysis of water rockets with air friction visible in the data. Drop a ball and measure g using Tracker.
- Video of hammer and feather falling on the moon.
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This teaching resource was developed with support from