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Tips to Remember for Kinematics and Projectile Questions

Some things you should know for projectiles (note that you haven’t done anything with angles yet, so you can ignore the sine and cosine parts):

  • The vertical and horizontal components are independent of each other.
  • The vertical velocity is usually Vy = V*sin(ϴ) horizontal velocity is usually Vx = V*cos(ϴ), where V is the hypotenuse, or resultant velocity.
  • The vertical acceleration is a = -9.8 m/s^2 and the horiztonal acceleration is (usually) zero, unless it tells you otherwise.
  • All those kinematics equations are usually just used for the vertical components.
  • In the horizontal, you generally just need to use D=VT, unless it tells you there is horizontal acceleration.
  • The time is the same, obviously, so you can find the time in the vertical and use it in a horizontal equation.
  • At the top of a projectile’s motion, it’s vertical velocity is zero. Its horizontal velocity is not zero.
  • The time it takes to reach the top of a projectile’s motion is one half of the object’s total time spent in the air.