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Published byElizabeth Austin Modified over 6 years ago

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The Nature of Force Newton’s Laws

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What is a Force? A force is a push or a pull. When one object pushes or pulls another object, you say that the first object is exerting a force on the second object. Forces are described not only by how strong they are, but also by the direction in which they act.

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Forces In order to create motion (or stop it ) you must have an unbalanced force. Balanced forces cancel each other out. (No motion) When two forces act in the same direction they add together. (creating an unbalanced force)

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When forces act in opposite directions, an one is larger than the other, the overall force is in the direction of the greater force.

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Newton’s Laws Isaac Newton was an English mathematician who discovered the three basic laws of motion. His first law: –An object at rest will stay at rest, and an object in motion will stay in motion unless acted on by an unbalanced force. AKA: Law of Inertia Inertia: the tendency of an object to resist change in its motion.

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Newton’s First Law The amount of inertia an object has, depends on its mass. The greater the mass, the greater its inertia. A lot of inertia! Very little inertia

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Newton’s Second Law Newton’s second law of motion states that The net force on an object is a product of its acceleration and its mass. Or, an easier way to remember this is: F =Mass x Acceleration

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Newton’s Second Law F = M*A Mass = 5 kg Let’s assume that the wheels of a 5-kg car apply 10 N of force. The net force would equal 10 Newtons. What is the acceleration of the car?

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Newton’s Third Law Newton’s third law states that: For every action, there is an equal and opposite reaction.

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Action-Reaction

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Recap! 1. An object in motion will stay in motion, or an object at rest will stay at rest unless acted on by an unbalanced force. 2. Force = Mass x Acceleration 3. For every action, there is an equal and opposite reaction.

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