Our Dynamic Universe

• • Wpara = mg*sin Θ
  • Wperp = mg*cos Θ
• When accelerating up or decelerating down, a lift makes your apparent weight heavier and the equation is F=T-W
• When accelerating down or decelerating up in a lift, your apparent weight is lighter and is calculated by F=W-T
• V/Fh = V/F*cos Θ

  V/Fv = V/F*sin Θ
• In a collision or explosion, provided there are no external forces, total momentum before is equal to total momentum after
• In an elastic collision momentum and Kinetic Energy are conserved whereas in an inelastic collision, only momentum is conserved.
• Projectiles:

  • The time of flight is 2* the time to the highest point
  • The vertical velocity at the highest point is 0m/s
• Newton's Laws

  1. An object will stay in motion or at rest unless acted upon by an unbalanced force
  2. Fun=ma
  3. Every action has an equal and opposite reaction
• Random Uncertainty = (max-min)/no. of readings
• Percentage uncertainty = (Error value/Actual value)*100
• Energy can't be created or destroyed, only transformed - e.g. Ep to Ek