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Everything in the world is in motion. Some forms of motion we can see clearly, such as the flight of an airplane. But even objects that seem still, such as rocks and buildings, contains atoms (tiny particles) that move minutely, or vibrate. The Earth itself is moving around the sun, and the entire universe is expanding. All motion requires force to start, to change speed or direction, or to stop.
Ответьте на вопрос:
What does all motion require?
All motion requires the sun.
All motion requires speed or direction.
All motion requires atoms.
All motion requires force.