1. S UMMARY OF C IRCULAR M OTION AND G RAVITY motion in a straight line motion in a circle v = v = T = ________________ Sometimes you know T without it being stated Ex. ___________________________________

2. A CCELERATION a = a c = a c = ________________________ Objects accelerate by changing _______________ or changing ___________________________. An object that is traveling at a constant speed in a circle is accelerating. Why?

3. F ORCE F = F c = F c = ________________________ You can also make another equation for F c by combining the last 2 equations. F c = centripetal force - the force needed to keep an object centrifugal force - _____________________________

4. G RAVITY F= F g = g= F g = The Universal Law of Gravitation : This equation shows us that everything ____________________ everything else. F g = G= The force of the attraction depends on the _____________ and the _________________ of the objects

5. F INDING G RAVITY To find the acceleration due to gravity at any distance from any object F g = F g m= ____________________________________ r= ____________________________________

6. F OR ORBITING OBJECTS In order for an object to orbit, what two forces must equal each other? =