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November 8 AP Physics

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Homework: 25, 26,27,28 Each group presents their problem

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In: If the moon has a mass of × 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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Newtons Law of Universal Gravitation

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Newtons 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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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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For the rest of class: 1-Gravitational problem set 2-Lab: centripetal force Finish the calculations Analysis Conclusion due at the end of class.

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

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A rubber stopper goes in a circle with a string of radius 2 meters. The string is inclined at 40 o from vertical. The stopper has a mass of.3 kg. The string has a tension of 10 N. How fast is the stopper going?

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