Gravity

Front

Most of the Universe is _____

Back

pretty empty

Front

Gravity from an object _____

Back

goes on forever

Front

Isaac Newton got into a bitter feud with _____

Back

Robert Hooke

Front

You can think of it as "how much stuff makes up an object"

Back

mass

Front

Which term is defined as "how much mass is inside a given volume"?

Back

density

Front

When the distance from an object is doubled, the force of gravity drops by a factor of _____

Back

4

Front

Go 3 times farther away and the force of gravity drops by _____

Back

9 times

Front

If there are no other forces acting on them, two objects with mass will _____

Back

accelerate toward each other

Front

What can be described as "falling and missing the ground"? Options: accelerating, free-falling, orbiting, attaining escape velocity

Back

orbiting

Front

A rock thrown hard enough sideways will orbit the Earth once every _____

Back

90 minutes