A falling object is acted on by gravity, which pulls downward with a force equal to the weight of the object.
In free fall with no air resistance, the acceleration of all objects is the same, regardless of weight.
When there is air resistance, a falling object will accelerate only until it reaches its terminal speed.
At terminal speed, the force of air resistance balances the force of gravity.
A path of a projectile is called its trajectory and is parabolic in shape.
The horizontal and vertical motions of a projectile are independent of each other.
If air resistance is ignored, a projectile moves with constant horizontal velocity and with constant vertical acceleration.
The trajectory of a projectile launched at an angle depends on the horizontal and vertical components of its initial velocity.