2. Video
From Mechanics
| Theory | Exercises | Video |
| Feather and Hammer on the Moon | |
| The Apollo astronauts conducted the now famous experiment where the drop a hammer and a feather on the moon. Due to the lack of atmosphere the two objects fall together under only the influence of gravity.
http://www.youtube.com/watch?v=5C5_dOEyAfk
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| Feather and Ball in a Vacuum | |
| This video clip compares the motion of a ball and a feather, when falling through the atmosphere and when falling in a vacuum.
http://www.youtube.com/watch?v=_XJcZ-KoL9o
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