When a body descends in air or another fluid, what determines its acceleration is the gravitational force minus the friction, not its mass.
There is no way to force a pendulum to oscillate at a different rhythm, determined exclusively by its length
Using simple materials like plastic bottles, straws, modelling clay, and syringes you can witness many interesting phenomena relating to air and water pressure.
The historian of science Alexander Koyrè summarised the scientific work of the sixteenth century as a gradual understanding of the works of Archimedes.
Probably of Paleolithic origin and present since the first civilisations, the sling is ancient and ubiquitous not only as a weapon, but also as the paradigm of circular movement.
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