2.  Galileo discovered that mass does not affect the time it takes for an object to fall to the ground.  Objects fall at the same rate (on earth it is 9.8 m/s 2 )  https://www.youtube.com/watch?v=_m CC-68LyZM https://www.youtube.com/watch?v=_m CC-68LyZM

3.  Air Resistance : the force that opposes the motion of objects through air › Depends on size, shape, and speed

4.  Terminal Velocity : objects fall at constant velocity, force of gravity is balanced by air resistance  What will a parachute do?

5.  Free fall : when gravity is pulling an object down and no other forces are acting on it  all objects accelerate due to Gravity at a rate of 9.8 m/s 2

6.  Orbiting objects are in free fall  Centripetal Force : unbalanced force that causes objects to move in a circular path › Two motions cause orbiting ( circular path )  Traveling around an object  Falling

7.  Projectile Motion : the curved path that an object follows when thrown near the Earth’s surface due to gravity. › Frog Leaping › Sprinkler › Diver › Ball being thrown