key concepts in physics

• what is the difference between weight and mass


  • mass is the amount of matter in an object measured in kg
  • weight is the force acting on the mass due to gravity (N)
  • mass remains constant whilst weight varies with gravitational field strength
• what is power?


  work/time
• in a distance time graph what does the gradient represent


  speed
• What is the equation for kinetic energy?


  1/2 x mass x velocity squared
• what is the equation for gravitational potential energy 


  GPE= height x mass x weight