Potential Energy Calculator
Energy (Joules)
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Kilojoules
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Fall Speed at Ground
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Understanding Gravitational Potential Energy
PE = mgh. Mass (kg), gravity (m/s^2), height (m) gives joules. Earth g=9.81, Moon g=1.62.
When falling, PE converts to KE: mgh = (1/2)mv^2, giving fall speed v = sqrt(2gh).
Hydroelectric dams convert water PE to electricity. 1000 kg falling 100 m = 981,000 J = 0.27 kWh.
Frequently Asked Questions
PE formula?
PE = mgh. On Earth, g=9.81 m/s^2.
Is PE relative?
Yes, depends on chosen reference height. Only changes in PE matter physically.
PE to KE conversion?
mgh = (1/2)mv^2. Total mechanical energy conserved (ignoring friction).
PE of climbing stairs?
70 kg person, 3 m stairs: PE = 70*9.81*3 = 2060 J = 0.49 food calories.