# Gravity is an attractive field force that acts between objects with mass. Gravity is an attractive field force that acts between objects with mass

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• ## New Vocabulary

• Kepler’s first law
• Kepler’s second law
• Kepler’s third law
• Gravitational force
• Law of universal gravitation

• ## Match Kepler’s Laws with the correct example:

• The distance from Earth to the Sun changes throughout the year.
• If you know the periods of Earth and Mars, as well as the Earth’s radius, then you can calculate the radius of Mars.
• Earth moves faster when it is closer to the Sun.

• ## Are the units correct?

• rC should be in Galileo’s units, like rI.
• ## Is the magnitude realistic?

• The period is large, so the radius should be large.

• ## Step 1: Analyze and Sketch the Problem

• Sketch the orbits of Io and Callisto.
• Label the radii.
• ## Step 2: Solve for the Unknown

• Solve Kepler’s third law for rC.

• ## According to Newton’s equation:

• F is inversely related to the square of the distance (r).
• F is directly proportional to the product of the two masses.
• F

• ## New Vocabulary

• Inertial mass – A measure of the object’s resistance to any type of force
• Gravitational mass – a quantity that measures an object’s response to gravitational force

• ## Plan Your Work and Work Your Plan

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