Equations to Learn

• weight


  weight = mass x gravitational field strength

  $W =$$mg$
• work done


  work done = force x distance (along the line of action of the force)

  $W =$$Fs$
• force applied to a spring

  force applied to a spring = spring constant x extension

  $F =$$ke$
• distance travelled


  distance travelled = speed x time

  $s =$$vt$
• acceleration


  acceleration = change in velocity / time taken
• resultant force


  resultant force = mass x acceleration
• momentum


  momentum = mass x velocity
• kinetic energy


  kinetic energy = 0.5 x mass x (speed squared)
• gravitational potential energy


  gravitational potential energy = mass x gravitational field strength x height
• power (et and t)


  power = energy transferred/time
• power (wd and t)


  power = workdone/time
• wave speed


  wave speed = frequency x wavelength
• density


  density = mass/volume