equations

• what is distance travelled 


  average speed x time
• what is acceleration?


  change in velocity / time
• what is the equation for force


  mass x acceleration
• what is the equation for weight


  mass x gravitational field strength
• what is the equation for momentum


  mass x velocity
• what is the equation for change in gravitational potential energy 


  mass x gravitational field strength x change in vertical height
• what is the equation for kinetic energy


  1/2 x mass x velocity squared
• what is the equation for efficiency?


  useful energy transferred by the device / total energy supplied to the device
• what is the equation for wave speed 


  frequency x wavelength
• what is the equation for wave speed 


  distance / time
• what is the equation for work done


  force x distance moved in the direction of the force
• what is the equation for power?


  work done / time taken
• what is the equation for moment of a force 


  force x distance normal to the direction of the force
• what is the equation for energy transferred


  charge moved x potential difference
• what is the equation for charge


  current x time
• what is the equation for potential difference 


  current x resistance
• what is the equation for power 


  energy transferred / time taken
• what is the equation for electrical power 


  current x potential differnce
• what is the equation for electrical power 


  current squared x resistance
• what is the equation for density 


  mass / volume
• what is the equation for force exerted on a spring


  spring constant x extension
• what is the equation for pressure


  force normal to the surface / area of the surface