Click here to go the reading pages for these questions.

You can either print this page or number your paper and answer the questions.

(1) What did Newton know about the Earth's dimensions, before coming up with his law of Universal Gravity?


(2) When was each piece of this information known to the world?


(3) What is the source for the centripetal force that keeps the Earth revolving around the Sun?


(4) Why is Newton's law of gravity called "universal?"

(5) Applying what you have read. Looking at the formula, explain how the term "inverse square law" applies to Newton's law of universal gravity.

(6) About how many years passed before Newton's Law became an equation?

(7) What is the formula for Newton's law of universal gravity?


(8) What does each variable stand for in the equation above?

(9) How far does the gravitational pull of the Earth extend?


by Tony Wayne ...(If you are a teacher, please feel free to use these resources in your teaching.)