P5c: Projectile Motion

P5c: Projectile Motion

1. An object PROJECTED HORIZONTALLY in the Earth's gravitation field

   • darts/missiles/balls

2. Path is CURVED a.k.a. TRAJECTORY

   • PARABOLIC
     • FASTER NEARER GROUND
     • SLOWER AT TOP

3. NEWTON'S PROJECTILE

   • A projectile thrown horizontally from a high point on Earth would never hit the ground if it was launched with enough speed
     • REMAIN in ORBIT above Earth

4. Horizontal Projection

   • A ball THROWN HORIZONTALLY from the top of a tower will fall to the ground at the same time as a ball DROPPED VERTICALLY
     • Horizontal
       • Acceleration=0
       • Time=Vertical time
       • HOW FAR
     • Vertical
       • Initial Velocity=0
       • Acceleration=10
       • Time= Horizontal time
       • HOW HIGH
     • EQUATIONS OF MOTION

5. Analysing Projectile Motion

   • AIR RESISTANCE IS IGNORED
   • Constant horizontal velocity
   • Steadily increasing vertical velocity
     • Accelerates towards the ground

6. Forces on Projectiles

   • When air resistance is IGNORED the force REMAINING is GRAVITY
     • ONLY affects VERTICAL VELOCITY
   • Accelerates downwards at 10m/s
   • Deccelerates at 10m/s
     • Moves upwards

7. DIAGRAM