Karina is conducting an experiment based on Isaac Newton's law of universal gravitation. She is testing the strength of the force of gravity between two objects. What factors determine the strength of the force of gravity?

What is any object that orbits another object in space?

Gravitational pull is greatest:

What is the movement of an object around another object?

Mr. Lee used a globe to demonstrate to his class that Earth rotates around a central line. He also demonstrated that Earth travels around the sun by picking up the globe and walking in a circle around his desk. It takes Earth one year to make one trip around the sun. What word is used to describe one object moving around another object?

What is the Law that says every object in the universe attracts every other object?

What is the centripetal force that holds planets in orbit?

Rachel reads about how astronauts appear to be weightless in space. She wonders how Earth stays in orbit around the sun when astronauts float while in orbit around Earth. She remembers that there is a force that keeps Earth in orbit around the sun. This force is the same force that keeps astronauts in orbit around the Earth. It also helps to explain why they appear to be weightless. What is this force?

The force that Earth exerts on the moon

What is the spinning motion of a planet on its axis?

What is an educated guess based on background information for a solution to a problem?