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Published byShannon Richard Modified over 9 years ago
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Newton ’ s Laws of Motion
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The Man Behind the Laws His mom wanted him to be a farmer. He was motivated at school by trying to be smarter than a bully. His college closed for a while because of the plague, and, while on break, discovered and wrote the law of gravity. He discovered calculus and even invented the reflective telescope (he ’ d also stare at the sun until he would lose his vision). There really was an apple tree — but the apple probably didn ’ t hit him in the head. He wondered why the apple always fell in a straight line and applied the idea to the moon
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The 3 Laws The law of inertia The law of acceleration The law of equal and opposite forces The laws are universal. Apply to planets and peas
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First Law: The law of inertia An object at rest remains at rest, and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force Friction is an unbalanced force Inertia means resisting change in motion
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Second Law: The law of acceleration The acceleration of an object depends on the object ’ s mass and the force applied to it A=f/m F=ma Explains why objects fall with same acceleration (10N=1kg)
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Third Law: Equal and Opposite Whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first Forces act in pairs Action and reaction forces act on different objects
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The Laws at Work
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