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-   -   Why does gravity give a constant acceleration and centrifuge? (http://www.physicsforums.com/showthread.php?t=353587)

sameeralord Nov10-09 07:42 PM

Why does gravity give a constant acceleration and centrifuge?
 
Hello everyone,

Normally if there is 1 kg object and I apply 10 N force it would accelerate at 10m/s. Here the acceleration is determined by the mass of object. How does gravity in the absense of resistance make objects travel at a fixed acceleration?

In a centrifuge a force equivalent to double or triple gravity is used. Does this force give a constant acceleration (9.8m/s2) like gravity too. How is that done?

Thanks!!

A.T. Nov11-09 01:53 AM

Re: Why does gravity give a constant acceleration and centrifuge?
 
Quote:

Quote by sameeralord (Post 2435930)
Normally if there is 1 kg object and I apply 10 N force it would accelerate at 10m/s. Here the acceleration is determined by the mass of object. How does gravity in the absense of resistance make objects travel at a fixed acceleration?

Acceleration is constant if the force is constant, which is not really the case for gravity, but rather an approximation for small fall distances.
Quote:

Quote by sameeralord (Post 2435930)
In a centrifuge a force equivalent to double or triple gravity is used. Does this force give a constant acceleration (9.8m/s2) like gravity too.

No, the centrifugal acceleration depends on the distance from the rotation center.


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