Unit 5 Review

Front

What is the law of inertia?

Back

An object will continue moving in a straight line unless acted upon by an unbalanced force.

Front

What causes Earth to move in an elliptical orbit around the sun?

Back

The gravitational force of the sun attracts Earth.

Front

What are the four inner planets of our solar system?

Back

Mercury, Venus, Earth, and Mars.

Front

True or False: Any object with mass has gravity.

Back

True.

Front

What process created the planetesimals?

Back

Accretion of particles in the solar nebula.

Front

What is a star?

Back

A celestial body composed of gases that emit light due to nuclear reactions.

Front

What is gravity?

Back

A force that attracts two bodies toward each other, proportional to their masses.

Front

What is the difference between inner and outer planets?

Back

Inner planets are rocky and closer to the sun; outer planets are gas giants and farther from the sun.

Front

What is the solar nebula theory?

Back

A theory that explains the formation of the solar system from a rotating disk of gas and dust.

Front

What role does the sun play in the solar system?

Back

The sun's gravitational force keeps the planets in orbit around it.