Gravity
The force that causes all objects to accelerate downwards at a rate of 9.8 m/s squared; the force that keeps the solar system together
Air Resistance
Decreases the acceleration of a falling object
Terminal Velocity
When the upward force of air resistance equals the force of gravity on a falling object
Free Fall
When the only force acting on an object is gravity
Projectile Motion
The curved path that an object follows when thrown near the earth's surface
Two Components of Projectile Motion
Horizontal and vertical force
Centripetal Force
The force caused by gravity that keeps objects in orbit
