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The cavendish experiment shows that even the very week force of gravity can be seen between two room scale objects. Even with the naked eye.

MyLundScience's video on the Cavendish experiment:    • The Cavendish Experiment - Obvious Gr...  
A video derivation of the Cavendish experiment equation:    • The Cavendish Experiment Explained  

Experimental procedure: https://www.ld-didactic.de/documents/...
Equipment user manual: https://www.ld-didactic.de/documents/...

Chapters:

00:00 the beginning
00:44 The Cavendish experiment
07:30 I get it working!


Corrections:

4:53 This isn't a fair comparison. Actually, if you changed the mass of the hanging masses in the experiment, it WOULD change the deflection angle. That's because the value of T in the equation would change. The torsion pendulum would oscillate more rapidly with lighter masses. Thanks James Gilbert.

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