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Old March 10th, 2010, 17:20   #65
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Join Date: Mar 2007
Location: Edmonton
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Wow, someone please confirm my number (I've double checked mine like 4 times)…

I got only 0.823 joules of Kinetic Energy for a 1” steel ball falling 50 inches. My method:

Gravitational Potential Energy = Kinetic Energy ***Losses due to air resistance ignored*** <-- This is a CONSERVATIVE assumption

Mass x Gravity x Height = Gravitational Potential Energy

Explanation: All of the Gravitational Potential Energy at 50 inches is transferred into Kinetic energy at zero inches…hence they are equal.


Gravity = 9.81 m/s
Density of steel = 7700 kg/m3
Height = 1.27 meters (50”)

I won’t completely spoon feed things to see if someone who knows what they’re doing gets the same answer as me.
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Last edited by Flatlander; March 10th, 2010 at 17:42..
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