Chapter 7 Vocabulary

States that the planets move in elliptical paths with the sun at one focus

• Kepler's First Law

• Kepler's Second Law

• Kepler's Third Law

• Law of Universal Gravitation

States that an imaginary line from the Sun to a planet sweeps out equal areas in equal time intervals

• Kepler's First Law

• Kepler's Second Law

• Kepler's Third Law

• Universal Law of Gravitation

States that the square of the ratio of the periods of any two planets is equal to the cube of the ratio of their average distance from the sun

• Kepler's First Law

• Kepler's Second Law

• Kepler's Third Law

• Universal Law of Gravitation

The attractive force between two objects that is directly proportional to the mass of the objects

• Law of Universal Gravitation

• Gravitational force

• Gravitational mass

• Gravitational potential energy

Mass as used in the law of universal gravitation; the quantity that measures an object's response to gravitational force

• Gravitational force

• Gravitational mass

• Gravitational potential energy

• Inertial mass

A measure of an object's resistance to any type of force

• Gravitational mass

• Inertial mass

• Relative mass

• Gravitational force