Mass and weight: Forces: Physics: GCSE (9:1)

• Mass


  A measure of the amount of matter in an object

  
• Weight


  The force acting on an object due to gravity

  
• Relationship between weight and mass

  The weight of an object is directly proportional to its mass
• W = mg


  The equation linking weight, mass and gravitational field strength

  
• W

  The symbol for weight

  
• m


  The symbol for mass

  
• g

  The symbol for gravitational field strength

  
• Newtons (N)


  The SI unit for force

  
• Kilograms (kg)


  The SI unit for mass

  
• Newtons per kilograms (N/kg)

  The SI unit for gravitational field strength
• Centre of mass


  The single point that the weight of an object may be considered to be acting at

  
• Newton meter


  A calibrated spring-balance that can be used to measure an object's weight