Weight, Mass and Gravity

• What is the role of gravity on Earth?

  It gives everything weight and keeps us grounded
• How does gravitational force affect masses?

  It attracts large masses like planets strongly
• What are the two important effects of gravity on a planet's surface?

  1. All things accelerate towards the ground
  2. It gives everything a weight
• What is the difference between weight and mass?

  Mass is the amount of 'stuff' in an object
• How does weight depend on gravitational field strength?

  Weight changes with gravitational field strength
• What is the weight of a 1 kg mass on Earth?

  9.8 N
• Why does a 1 kg mass weigh less on the Moon?

  Because the Moon has a weaker gravitational field
• How is weight measured?

  Using a calibrated spring balance
• What is the centre of mass of an object?

  It is the point where weight acts
• What is the equation relating weight, mass, and gravitational field strength?

  W = mg
• What does it mean that weight is directly proportional to mass?

  If mass doubles, weight also doubles
• What is the weight of a 5 kg mass on Earth?

  49 N
• What is the weight of a 5 kg mass on the Moon?

  8 N
• How do you calculate mass if weight and gravitational field strength are known?

  m = W ÷ g
• What is the mass of a buggy if its weight on Mars is 4452 N?

  1200 kg
• What is the value of g on Earth?

  9.8 N/kg
• What is the value of g on the Moon?

  1.6 N/kg
• Why is the value of g greater for Earth than the Moon?

  Earth has a stronger gravitational field
• What unit is weight measured in?

  Newtons
• What unit is mass measured in?

  Kilograms
• What does the symbol "∝" represent in the context of weight and mass?

  It indicates direct proportionality
• What does it mean when two letters are written next to each other in an equation?

  It means they are multiplied together
• What does the "=" sign mean in equations?

  It means approximately equal to
• What is the significance of the gravitational field strength at an object's location?

  It determines the object's weight
• What happens to weight if the mass of an object is increased?

  Weight increases proportionally with mass