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# What is Newton's first law?

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Newton's first law states, "Every object persists in its state of rest or uniform motion in a straight line unless it is compelled to change that state by forces impressed on it." A more colloquial way of saying it is "an object in motion stays in motion."

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Newton's first law, one of his three laws of motion, describes inertia. For example, if a ball is set in motion, it keeps going unless a force stops it from going farther. A number of forces could stop it, such as friction as the ball rolls across the surface. Other things could make it go faster, such as a fan blowing behind it or gravity pulling it down a slope. Similarly, an object that is not moving stays still unless something acts upon it to move it, such as a cat's paw swiping at the ball. Newton describes how velocity changes in his second law.

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## Related Questions

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Newton's second law of motion is Force = Mass x Acceleration. What this states is that the acceleration of an object is dependent upon two variables, which are the net force acting upon the object and the mass of the object.

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Newton's third law states that for every action there is an equal and opposite reaction. This means that when an object puts a force on another object, the second object exerts the same amount of force against the first object.

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Newton's law of viscosity is a constitutive equation that describes how a fluid resists attempts to move through it. It holds true with some liquids and fails in others. Therefore, it is not considered a fundamental law of nature.