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November 2 AP Physics

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In: If the moon has a mass of × 1022 kg, an orbital speed of km/s an orbital radius of km, What is the gravitational force of the earth moon system?

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**Objective: To find out about the law of universal gravitation.**

Success criteria: You will be able to solve universal gravitational problems.

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Homework: #52

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**Newton’s Law of Universal Gravitation**

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**Newton’s Law of Universal Gravitation:**

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Problem: Oscar (mass=65kg) and Olivia (mass=45 kg) sit 2 meters apart in physics class. What is the force of gravitational attraction between them? Does this cause them to drift toward each other?

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**Gravitational force is a vector**

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**Anything that spreads out from a point source**

Inverse square laws Anything that spreads out from a point source Gravitational force Electrical force Sound intensity Light intensity Radiation intensity

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**Inverse square law - gravitation**

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**Inverse square law – light intensity**

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Light intensity

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**Inverse square law - radiation**

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**Inverse square law – electric force**

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**Sound spreads out as an inverse square**

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**Gravitation problem set:**

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Out: If the distance between two point particles is doubled, then the gravitational force between them: Decreases by a factor of 4 Decreases by a factor of 2 Increases by a factor of 2 Increases by a factor of 4 Cannot be determined without knowing the masses.

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The Newtonian Synthesis Nicolaus Copernicus 1473 – 1543 Frame of Reference Tycho Brahe1546- 1601 Accurate Data Johannes Kepler1571-1630 Emperical Laws.

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