Universal Gravitation

What is the equation we already know for the force of gravity?

Do you have your notebook out on your desk

• Yes

• No

• Umm. Getting it out right now

• I don't need notes

In physics is G the same as g?

• Yes

• No

Why are there two different masses in the equation?

What does r stand for?

• radius

• center to center distance

• round

• revolution

A ball is dropped from the second story of a building. Which equation for the force of gravity should you use?

• Fg=mg

• Fg=(G*m1*m2)/(r^2)

• g=10 m/s/s

• G=6.67*10^-11 Nm^2/kg^2