Excellent question. It turns out that this is arbitrary, the linear kinetic energy of an object (as opposed to rotational energy) disappears with a simple coordinate transformation. In other words, you don't notice the kinetic energy of trains if you're sitting comfortably inside one.
But its motion induces energy-dissipating tidal activity on the earth, and the energy required to do this must come, in some part, from the kinetic/gravitational energy of its orbit. "Conceivably", the energy associated with the rotation of the earth about its own axis is subtly dissipated by interaction with the moon.
By definition, kinetic art is art from any medium that contains movement perceivable by the viewer or depends on motion for its effect. Early bike-part wind spinner by Brook Taylor. Suggested price ...
Cosmic Energy by Genius @ Play is a cosmos space themed kinetic art sculpture that acts as a moving, spinning, rotating motion of art for your desk or the education of a young one. Cosmic Energy Meditation
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A blob of material in outer space moves at 3 m/s when it collides and sticks to a half-as-massive blob initially at rest. Compared with the initial kinetic energy of the 3-m/s blob, the kinetic energy of the coupled blobs is
Momentum compared to kinetic energy. Momentum and kinetic energy are both measures of the amount of motion, and a sideshow in the Newton-Leibniz controversy over who invented calculus was an argument over which quantity was the “true” measure of motion.
In an elastic collision the kinetic energy of the colliding body can change but the total kinetic energy of the system remains the same. In an inelastic collision, kinetic energy is not conserved but conservation of momentum is. In everyday examples of collisions on Earth, energy is lost through thermal energy or sound.
But that makes me wonder. If a meteor is drifting through space, and it ends up caught in Earth's gravitational field (and is coming in at the right angle, etc,) it will fall to the surface of the Earth, converting potential energy into possibly a few megatons of kinetic energy.
An astronaut floating alone in outer space throws a baseball. If the ball moves away at 20 m/s, the astronaut will move in the opposite direction at a lower speed.
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