A Projectile Motion

-Projectile

.any object thrown in the air

.acted upon only gravity

.follow a path called a trajectory

-Centripetal Acceleration

.acceleration toward the center of a circular path

.caused by centripetal force

-On the ground...

.friction provides centripetal force

-In orbit...

.gravity provides centripetal force

-Free Fall

.when an object is influenced only by the force of gravity

-Weighlessness

.sensation produced when an object and its surroundings are in free-fall.

.object is not weightless!

.surroundings are falling at the same rate so they dont exert a force on the object.