Physics 9

• Projectile motion is a form of motion where an object moves in a curved path
• Projectile


  The object that is thrown or projected and exhibits projectile motion
• Trajectory


  The curve-like path undertaken by a projectile
• Projectile motion consists of horizontal and vertical motion working independently
• Horizontal motion


  • No resistance in any form
  • Constant horizontal velocity (vx)
  • Horizontal acceleration is zero
• Range


  The horizontal distance (dx)
• Vertical motion


  • The force acting is the force of gravity (g or ay)
  • Constant acceleration due to gravity (-9.8 m/s^2)
  • Vertical velocity is not constant (vy)
  • Vertical distance is the height (dy)
• Solving a problem on horizontal launched projectile

  1. Given: Horizontal distance (dx), Initial velocity (vi), Acceleration due to gravity (g)

  2. Find: Height of table (dy), Final velocity (vf)

  3. Steps: 1. Find time using dx and vi

  2. Use time to find dy

  3. Use dy to find vf
• The negative sign in the final velocity indicates the downward direction