Dictionary:Newton’s laws

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{{#category_index:N|Newton’s laws}} 1. First law of motion: A body does not change its state of motion unless acted on by an external force. Second law: Acceleration equals the unbalanced force divided by the mass. Third law: If two bodies interact, the force exerted by the first on the second equals the force exerted by the second on the first. 2. Newton’s law of universal gravitation: See gravitational constant Named for Sir Isaac Newton (1642–1727), English physicist.