November 2 AP Physics.

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Newton’s Law of Universal Gravitation

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Presentation transcript:

November 2 AP Physics

In: If the moon has a mass of 7.347 7 × 1022 kg, an orbital speed of 1.022 km/s an orbital radius of 384 399 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.

Homework: #52

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 - radiation

Inverse square law – electric force

Sound spreads out as an inverse square

Gravitation problem set:

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.