gravity

• what is weight?

  force acting on an object due to gravity
• The force of gravity close to the Earth is due to the gravitational field around the Earth
• The weight of an object depends on the gravitational field strength at the point where the object is.
• weight = mass x gravitational field strength
• what is weight measured in?

  N
• The weight of an object may be considered to act at a single point referred to as the object’s ‘ centre of mass ’
• The weight of an object and the mass of an object are directly proportional.
• what is weight measured with?

  calibrated spring balance ( newtonmeter )
• what does ∝ mean?

  proportional
• what is centre of mass?

  point where mass of an object can be considered to act