Gravitational field strengths and potential energy

• How can gravity be defined?

  Gravity is a force of attraction between two objects.
• What factors determine the size of the gravitational force?


  The size of the gravitational force depends on the mass of the objects and the distance between them.
• What is weight in physics?


  It is a force in a gravitational field strength and can be changed by the strength of gravity
• What is the equation for the gravitational potential energy?


  Ep=mgh (mass (kg) x gravitational field strength x height (m) )
• What is the equation for weight?


  Weight= mass x gravitational field strength
• What is the gravitational field strength of Earth?


  9.8 N/Kg
• • The mass of an object is the same anywhere in the universe, its the amount of weight (gravitational force) that changes
• A car on Earth experiences a downwards weight of 8820N . What is the mass?

  Weight/gfs= mass

  8820/9.8 = 900kg
• What is the units of weight (force of gravity)?


  Newtons (N)
• What is the units of gravitational potential energy?


  Joules (J)