STAAR Review #2 8th Grade Science

Front

What indicates a new substance has formed when mixing two clear liquids?

Back

A yellow solid forms and then settles to the bottom of the beaker.

Front

As the _________ of a star increases, what happens to its luminosity?

Back

Luminosity increases.

Front

What is the term for the orbiting of an object around another object?

Back

Revolution.

Front

How often does the moon phase cycle repeat?

Back

About every 29 days.

Front

What are forces that have a net force of zero called?

Back

Balanced forces.

Front

What is the definition of a balanced force?

Back

Forces acting on an object that are equal in size and opposite in direction, resulting in no change in motion.

Front

What is the definition of an unbalanced force?

Back

Forces that cause a change in the motion of an object because they are not equal and opposite.

Front

What is the difference between rotation and revolution?

Back

Rotation is the spinning of an object around its own axis, while revolution is the movement of one object around another.

Front

What is the term for the position of the sun in relation to the Earth that causes seasons?

Back

The tilt of the Earth's axis.

Front

What is the definition of luminosity in relation to stars?

Back

The total amount of energy emitted by a star per unit of time.