Gravitational Fields Flashcards

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1
Q

What is the definition of gravitational field strength?

A

Gravitational force exerted per unit mass on a small object placed at that point within the field

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2
Q

What does Newton’s law of gravitation state?

A

Force is directly proportional to the product of the masses and inversely proportional to the square of their seperation

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3
Q

What is Kepler’s first law?

A

The orbit of a planet is an ellipse with the Sun at one of tow foci

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4
Q

What is Kepler’s second law?

A

A line segment joining a planet and the Sun sweeps out equal areas during equal intervals of time

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5
Q

What is Kepler’s third law?

A

The square of the orbital period T of a planet is directly proportional to the cube of its average distance r from the sun

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6
Q

What are three features of a geostationary orbit?

A

Orbit above the Earth’s equator
Rotate in the same direction as the Earth’s rotation
Have an orbital period of 24 hours

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7
Q

What is the definition of gravitational potential?

A

The gravitational potential at a point in a gravitational field is defined as the work done per unit mass to move an object to that point from infinity

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8
Q

What is the definition of gravitational potential energy?

A

The gravitational potential energy of any object object with mass m within a gravitational field is defined as the work done to move the mass from infinity to a point in a gravitational field.

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