Gravity

• What is gravity?

  The force of attraction between all masses
• What is the definition of the mass of an object?

  The amount of matter it contains
• What is the definition of the weight of an object?

  The force acting on an object due to gravity
• What is the equation for weight?

  Weight = mass x gravitational field strength
• What is the force of Gravity close to Earth caused by?

  The gravitational field around the planet
• What does the weight of an object depend on?

  The gravitational field strength of where the object is , and is directly proportional to its mass
• What does this symbol mean : ∝ ?

  Two things are proportional
• How can you determine an objects weight?

  A newton meter (Or calibrated spring balance)
• What is the gravitational field strength?

  A measure of the force of gravity in a particular location
• What is the GFS on Earth?

  9.8 N/kg ( Or 10 N/kg)
• What is the GFS on the Moon?

  1.6 N/kg
• What is the centre of mass?

  A single point where the weight of an object acts
• Weight is measured in newtons (N)
• Mass is measured in kilograms (kg)
• Gravitational field strength is measured in newtons per kilogram (N/kg)