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Isaac Newton’s Laws of Force and Motion
1. “Objects at rest want to stay at rest. Objects in motion want to stay in motion.”
2. “To change an object’s motion, you must apply a force.”
3. “For every action there is an equal and opposite reaction.”
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Inertia∝mass
Isaac Newton, physicist, mathematician and
aspiring hair model
7
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Galileo’s Law of Falling Objects
“All objects falling because of gravity fall at exactly the same speed, regardless of how heavy or light the objects are.”
Galileo Galilei, physicist and astronomer
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Gravity ∝mass
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Inertia∝mass
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Conservation of Angular Momentum
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Momentum∝mass AND velocity AND radius
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Right-Hand Rule
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What did we learn today?
• Newton and Inertia• Moving things stay moving• Stationary things stay stationary• Unless you apply a force
• Galileo and Gravity• Mass doesn’t matter – angle matters
• Rotating objects are different • Shape matters
• Some things don’t change and that’s very useful for understanding • Momentum, angular momentum, and energy