2026-08-16 10:32:30: Translational Kinetic Energy

2026-08-16 10:32:31 -04:00
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+[[Work Energy and Power]]
+
+Formula is: $$K=\frac{1}{2}mv^2$$
+$K$ in joules
+$m$ in kg
+$v$ in m/s
+
+* Kinetic energy is scalar, only magnitude and never negative.
+* Because velocity is squared, changing speed affects energy more than changing mass.
+* For a system of objects, total kinetic energy is the sum of each object's kinetic energy.
+* Different observers in different reference frames can calculate different kinetic energies.
+
+If a dude standing on earth sees a 1kg ball travelling at 10m/s, he'll calculate it as 50J. If a dude taped to the ball calculates it he'll calculate 0J. If a theoretical god looked at it from a universal standpoint he'd probably calculate like $1*10^6$ Joules due to Earth orbiting the sun and the solar system orbiting the Milky Way.
+
+In a collision, total energy before and after is consistent in the observers frame.
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+[[physics]]
+WEaP
+