basic physics 1.1

• centre of gravity 


  the point where the force of gravity acts
• principle of moments 


  if an object is in equilibrium ACW=CW
• moment 


  turning effect about a point
• resolving vectors


  you must calculate the component of the force in the direction you require
• adding vectors at right angles

  pythagoras
• density 


  measure of how concentrated the mass in a material is
• vector quantity 


  magnitude and direction
• scalar quantity


  magnitude only