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Motion and Historical Figures

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Keywords Aristotle Galileo Sir Isaac Newton ForceInertia

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The Greek philosopher Aristotle (380 BC) He came up with “natural motion” "What goes up...must come down."

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2000 years later - Italian physicist Galileo: Galileo wondered why things stopped moving. He came up with a invisible force called friction. "without friction, an object in motion would continue to move forever." friction

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Sir Isaac Newton

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1687 - Isaac Newton rewrote the laws of motion. Most famous for his ideas on gravity, and the Three laws of motion. FIRST LAW – called the Law of Inertia: "An object at rest tends to stay at rest and an object in motion tends to stay in motion; unless acted upon by an unbalanced force."

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"keep on doing what they're doing" How well an object resists changes in its state of motion depends how heavy it is (it’s mass). The more mass, the more inertia - the more it will resist changes in its state of motion. Inertia: resistance an object has to changes in its state of motion.

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The truck has most mass and so the most inertia. It would also be the hardest to STOP moving. It is the hardest to START moving.

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Force: a vector with the units - Newton (N). "An object at rest tends to stay at rest and an object in motion tends to stay in motion; A force is a push or a pull unless acted upon by an unbalanced force." F

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When all forces acting on an object are, the motion of the object will NOT change. Therefore - Unbalanced forces will cause the acceleration of an object (non-uniform motion). balanced Unbalanced

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The same principle applies to all occupants and objects in a vehicle. Thrown from a bike or through the windshield.

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Use your experiences to explain whiplash injury in an accident - using the term inertia.

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