Work and energy

• When is work done?

  When a force acts on a moving body or moves something
• What’s an example of work?

  Walking up the stairs
• What is the equation for work done?

  Work = Force x Distance
• What does the W stand for in the work done equation?

  Work done
• What is work done measured in?

  Joules
• What does the F stand for in the work done equation?

  Force
• What is force measured in?

  Newtons
• What is the d in the work done equation?

  Distance
• What is distance measured in?

  Metres
• What does work equal?

  Energy transferred
• What can work possess?

  Energy
• What is the energy for position?

  Potential energy
• What is the energy for motion?

  Kinetic energy
• What is the energy for deformation?

  Elastic energy
• What is Gravitational potential energy?

  Where you are above the earths surface is your GPE
• What does GPE depend on?

  Mass and height above the ground
• What is the equation for GPE?

  GPE = mgh
• What does GPE stand for?

  Gravitational Potential Energy
• What is GPE measured in?

  Joules
• What does the m stand for in the GPE equation?

  Mass
• What is mass measured in?

  Kilograms
• What does the g stand for in the GPE equation?

  Gravitational field strength
• What is gravitational field strength measured in?


  Newton per kilogram
• What is the h in the GPE equation?

  Change in height
• What is a change in height measured in?

  Metres
• What do all moving objects have?

  Kinetic energy
• What does kinetic energy depend on?


  Mass and speed
• What is the equation for kinetic energy?


  $KE=$$1/2mv^2$
• What does KE stand for?

  Kinetic energy
• What does the m stand for in the kinetic energy equation?

  Mass
• What does the v stand for in the kinetic energy equation?

  Speed
• What is speed measured in?

  m/s
• When do elastic objects store EPE?

  When stretched or squashed
• When is work done in an elastic object?

  When its shape changes and it stores EPE
• What is EPE?


  Elastic Potential Energy
• The extension of an elastic object is directly proportional to the force applied
• What is Hooke’s Law?

  F=K*x
• What does k stand for in Hooke’s Law?

  Spring constant
• What does x stand for in Hooke’s Law?

  Extension
• What is spring constant?

  The gradient of a force-extension graph