phys

• Acceleration


  Difference in speed/time
• Weight


  Mass x gravity
• Force (Hooke's Law)


  Constant x extension
• Force (Newton's 2nd Law)

  Mass x acceleration
• Moment


  Force x distance from pivot
• Kinetic energy


  1/2 x mass x velocity2
• Gravitational potential energy


  Mass x gravity x height
• Efficiency


  Useful energy output/total energy input
• Work done


  Force x distance
• Power


  Work done/time taken
• Pressure in solids


  Force/area
• Pressure in liquids


  Density x gravity x height
• Pressure in gasses


  Constant/volume
• Specific heat capacity


  Energy transferred/mass x temperature change
• Wave velocity


  Frequency x wavelength
• Refractive index


  Sin i/sin r
• Refractive index (speeds of light)


  Speed of light in vacuum/speed of light in material
• Refractive index (critical angle)

  1/sin critical angle
• avg orbital spd v

  ( 2 x pi x radius ) / Time
• Hubble constant H0


  v (galaxies recede) / distance
• Age of universe


  = distance / v (recede)

  = 1 / Hubbles constant
• Impulse 


  F Δt =  Δ(mv)
• Force (momentum)


  (mv - mu) / t
• conserve momentum


  m1v1 = m2v2
• Pressure, volume


  P1V1 = P2V2
• GPE lost

  = KE gain