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Physics
The Moon
Isaac Newton

Why do objects fall at the same rate of acceleration?

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April 11, 2013 11:55PM

There are several ways to look at this; for example:


1) If you have an object of 1 kg, it will accelerate at a certain rate. Two separate objects of 1 kg each will also accelerate at the same rate. Now, if you join them, there is no reason why they should suddenly accelerate faster, or slower, just because they are together.


2) For an object of 2 kg, there is twice the force acting on it, to pull it down. However, this is compensated by the fact that the object also has twice the inertia, so it takes twice the force to give it a certain acceleration.


Earth's gravitational field, near the surface, is about 9.8 meters/second2. This is the same as 9.8 newton/kilograms; that is, each kilogram is subjected to a force of 9.8 newtons.