# November 8 AP Physics.

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November 8 AP Physics

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

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?

Objective: To find out about the law of universal gravitation.
Success criteria: You will be able to solve universal gravitational problems.

Newton’s Law of Universal Gravitation

Newton’s Law of Universal Gravitation:

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?

Gravitational force is a vector

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

Inverse square law - gravitation

Inverse square law – light intensity

Light intensity

Inverse square law – electric force

Sound spreads out as an inverse square

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

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.

A rubber stopper goes in a circle with a string of radius 2 meters
A rubber stopper goes in a circle with a string of radius 2 meters. The string is inclined at 40o 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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