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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
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:
a) Decreases by a factor of 4b) Decreases by a factor of 2c) Increases by a factor of 2d) Increases by a factor of 4e) Cannot be determined without knowing
the masses.