What is motion?

What is motion?  Give examples.

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Motion, when referred to in a physical sense, is any change in an object's position with regards to velocity, acceleration, displacement, or time. According to Sir Isaac Newton's Laws of Motion, an object is either at rest or in motion.

Consider a sleeping human being for instance--at first glance, he appears motionless. His external physical body is resting, but there are functions going on inside him all the time. His heart never quits beating; he never quits breathing; his blood and lymph never quit circulating; his ears never quit listening; his nerves never quit firing. And, at the microscopic level, his cells are constantly dividing and regenerating and his white blood cells are gobbling up germs! These are called "imperceptible" motions.

If you go to the subatomic level of matter, protons and electrons are constantly shifting and changing places. In outer space, the planets and stars move through the universe. On this planet, continents drift, ocean currents flow, and the wind blows. All nature is in motion!

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