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L8-Newton

# L8-Newton - The Newtonian Model Physics 7B Lecture 8 Prof...

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The Newtonian Model Physics 7B - Lecture 8 Prof. John Conway

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Newton’s Laws (1666) 1. Every object persists in its state of rest or uniform motion in a right line unless it is unless it is compelled to change that state by forces impressed upon it. 2. The alternation of motion is ever proportional to the motive force impressed, and is made in the direction of the right line in which that force is impressed. 3. To every action there is always opposed and equal reaction; or the mutual actions of two bodies upon each other are always equal and directed to contrary parts. Isaac Newton (1642-1727)
Newton’s Laws (1666) Isaac Newton (1642-1727) We can write Newton’s Laws very simply and mathematically:

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Acceleration acceleration is the rate of change of velocity: acceleration, like velocity, is a vector quantity Some counterintuitive facts: acceleration can be in any direction! a particle at rest can be accelerating! even if a particle is accelerating, its speed may or may not be changing!
Problem Solving Two ways (approaches, models) to solving mechanics problems: 1. The “force” way. Use details of forces to determine motion of bodies

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L8-Newton - The Newtonian Model Physics 7B Lecture 8 Prof...

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