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Have you ever noticed, how everything that you throw up in the air, falls down directly perpendicular to the ground, towards it's center with an acceleration (keeps falling faster and faster)?
We call those two natural phenomenon The Force Of Gravity and Gravitational Acceleration. The gravitational accelerariton is exactly 9,81 m/s2. That means the object that you threw into the air is falling 9,81 meters per second faster each second. The Gravitational Acceleration is the same for every object and material you care to throw, regardless of it's weight.


Gravity experiment:
Things you will need:
- a rock
- a sheet of A4 paper
- a high ledge (balcony,…)
Step1:
Crumple the paper to make a paper ball out of it.
Step 2:
Hold the rock and paper at about equal hight.
Step 3:
Drop the paper and rock at the same time
Both the rock and the paper should hit the ground at pretty much the same time and with the same speed (if you have someone measure the amount of time it takes for each of the objects to fall down with a stopwatch, the times might vary slightly, but those differences should be negligible). This happens because gravity affects all things the same way, regardless of their weight.