(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?
