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The focus of Lesson 1 is Newton's first law of motion - sometimes referred to as the law of inertia. An object at rest stays at rest and an object in motion stays in motion with the same speed

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motion can be formally stated as follows: The acceleration of an object as produced by a net force

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that in every interaction, there is a pair of forces acting on the two interacting objects.

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the speed of something in a given direction

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strength or energy as an attribute of physical action or movement.

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a coherent, typically large body of matter with no definite shape.

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a tendency to do nothing or to remain unchanged.

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increase in the rate or speed of something.

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the resistance that one surface or object encounters when moving over another.

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he force that attracts a body toward the center of the earth, or toward any other physical body having mass.

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he action or process of moving or being moved.