Gravity & GPE

• Gravity is a forces of attraction between 2 objects
• Gravity has a big influence over nearby objects 


  gravitational field strength
• To calculate the weight of an object you do

  Mass x gravitational field strength
• weight and mass are different things 


  Weight is the force acting on the object in a gravitational field

  Mass is an intrinsic property of an object
• To lift up an object requires energy or work


  The energy that is used is transferred to the object’s gravitational potential energy store
• Formula of gravitational potential energy store

  E p=mgh
• Mass is measured in kilograms (kg)
• Weight is measured in newtons (N)
• The gravitational field trench for earth is 9.8