When something is in motion, its position changes. A moving body changes its position, and moves from one place to another. Speed is the measure of how fast something is moving. A force, that is, a push or pull, is needed to get something moving. When you push something, you move it away from you. When you pull something, you move it toward you. Friction is the force that occurs when two objects rub against each other.
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The correct answer is
The smallest number is the one that comes first while counting.
To arrange the given numbers in order from smallest to greatest, find the smallest number among all the given numbers.
21 is the smallest number.