Projectile Motion

1
Projectile Motion

• an object upon which the only force acting is
  gravity

2
Types of Projectiles
3
Types of Projectiles

• an object dropped from rest
• an object which is thrown vertically upwards
• an object is which thrown upwards at an angle is
  also a projectile
• In all situations provided that the influence of
  air resistance is negligible

4
Projectile- by definition

• A projectile has only one force acting upon - the
  force of gravity.
• If there were any other force acting upon an
  object, then that object would not be a
  projectile.

5
"How in the world can an object be moving upward
if the only force acting upon it is gravity?"

• This means that you do not believe or you
  challenge Newtonian physics.
• Newton's laws suggest that forces are only
  required to cause an acceleration (not a motion)
• And in the case of a projectile that is moving
  upwards, there is a downwards force and a
  downwards acceleration that is, the object is
  slowing down.

6
The monkey and the zookeeper
7
Components of a projectile

• The path of a projectile has a horizontal
  component and a vertical component.
• The projectile moves forward because of inertia.
• The projectile accelerates downward because of
  gravity.
• A projectile's path is always a parabolic curve.
  
• Check it out!