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The action or process of moving or being moved. Motion (physics), the movement of changing place called motion. A formal proposal put to a legislature or committee
https://en.wikipedia.org/wiki/Motion

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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 with the same speed and in the same direction unless acted upon by an unbalanced force
http://www.physicsclassroom.com/class/newtlaws/Lesson-1/Newton-s-First-Law

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Newton's second law of motion can be formally stated as follows: The acceleration of an object as produced by a net force. In the same direction as the net force, and inversely proportional to the mass of the object.
http://www.physicsclassroom.com/class/newtlaws/Lesson-3/Newton-s-Second-Law

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Formally stated, Newton's third law is for every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the first object equals the size of the force on the second object.
http://www.physicsclassroom.com/class/newtlaws/Lesson-4/Newton-s-Third-Law

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Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
https://en.wikipedia.org/wiki/Friction

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A vehicle's capacity to gain speed within a short time. Increase in the rate or speed of something. The rate of change of velocity per unit of time.

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Commercial-based, cable and satellite television network owned by Discovery Communications.
https://en.wikipedia.org/wiki/Velocity_(TV_network)

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Gravity is a force pulling together all matter (which is anything you can physically touch). The more matter, the more gravity, so things that have a lot of matter such as planets and moons and all stars pull more strongly.
http://www.qrg.northwestern.edu/projects/vss/docs/space-environment/1-what-is-gravity.html

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Force are also described as a push or pull on an object. They can be due to phenomena such as gravity, magnetism, or anything that might cause a mass to accelerate. In physics, a force  is any interaction that, when unopposed, will change the motion of an object.
https://en.wikipedia.org/wiki/Force

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In physics, mass is a property of a physical body. It is the measure of an object's resistance to acceleration (a change in its state of motion) when a net force is applied.
https://en.wikipedia.org/wiki/Mass

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The property of matter by which it retains its state of rest or its velocity along a straight line so long as it is long as it not acted upon by an external force.