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.

Air Resistance

-Terminal Velocity

.maximum velocity reached by a falling object

-No net force

.no acceleration

.constant velocity

-Falling wth air resistance

.heavier objects fall faster because they accelerate to higher speeds before reaching terminal velocity

-Larger Force gravity

.need larger force of air

.need higher speed

FORMULAS:

for finding the:

-force~F=ma

-mass~M=f/a

-acceleration~A=f/m

F=ma

Force=Newtons-kg x m/s [squared]

Mass=kilograms

Acceleration=m/s [squared] (9.8 m/s [squared])