The decrease of the inclination of pisa tower , italy was achieved by
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The Center of Gravity
Every object has a mass and it has something called center of gravity (or center of mass). The center of gravity is that point inside the object where all the mass should be concentrated if we want to approximate the object with a point and keep its inertial properties. Holding an object by its center of mass keeps it in perfect equilibrium as gravity acts with the same torque in any direction around that point.
While this concept comes handy when you are in school studying physics (or if you want to impress your friends balancing a knife on your finger) it has little or no use in everyday life.
When talking about the Leaning Tower of Pisa, the concept of center of gravity comes to be very important.
Any object that stands (typically on its base) will keep standing (or falling back onto its base) until the line drawn from its center of gravity to the ground falls within its base (see image on the right).
The mass of the Leaning Tower is about 14500 metric tons and, given its geometry (thin at the top and thick at the bottom), its center of mass sits somewhere lower than the top of its 4th floor.



Today, the Tower leans so much that a vertical line drawn from its outer edge (on the 7th floor) meets the ground 4 meters far from the base.
Somewhen around the year 1600, Galileo Galilei took advantage of the unique geometry of the Tower to conduct experiments on gravity by throwing objects down from its leaning side.
He successfully demonstrated that the mass of an object has no influence on the speed he gathers while falling towards the ground.
In 1600 the Tower was leaning much less than today and its offset to the ground was surely not 4 meters. However, it was enough for Galileo to carry on his experiments and write an important page of history and science.
Every object has a mass and it has something called center of gravity (or center of mass). The center of gravity is that point inside the object where all the mass should be concentrated if we want to approximate the object with a point and keep its inertial properties. Holding an object by its center of mass keeps it in perfect equilibrium as gravity acts with the same torque in any direction around that point.
While this concept comes handy when you are in school studying physics (or if you want to impress your friends balancing a knife on your finger) it has little or no use in everyday life.
When talking about the Leaning Tower of Pisa, the concept of center of gravity comes to be very important.
Any object that stands (typically on its base) will keep standing (or falling back onto its base) until the line drawn from its center of gravity to the ground falls within its base (see image on the right).
The mass of the Leaning Tower is about 14500 metric tons and, given its geometry (thin at the top and thick at the bottom), its center of mass sits somewhere lower than the top of its 4th floor.



Today, the Tower leans so much that a vertical line drawn from its outer edge (on the 7th floor) meets the ground 4 meters far from the base.
Somewhen around the year 1600, Galileo Galilei took advantage of the unique geometry of the Tower to conduct experiments on gravity by throwing objects down from its leaning side.
He successfully demonstrated that the mass of an object has no influence on the speed he gathers while falling towards the ground.
In 1600 the Tower was leaning much less than today and its offset to the ground was surely not 4 meters. However, it was enough for Galileo to carry on his experiments and write an important page of history and science.
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