physics

• Mass


  The amount of matter in an object
• Weight


  The gravitational force on an object
• Weight is a gravitational force
• Mass and weight are distinct concepts
• Comparing weights (and hence masses) using a balance


  1. Place objects on balance

  2. Compare weights
• Mass


  • Property that 'resists' change in motion
• Gravitational field strength


  The force experienced by a mass due to gravitational attraction
• Gravitational field strength (g) has two meanings:
• Calculating acceleration of rocket

  Given: Mass = 500 kg, Upward force = 6000 N, Weight = 4900 N

  Resultant force = Upward force - Weight = 6000 - 4900 = 1100 N

  Acceleration = Resultant force / Mass = 1100 / 500 = 2.2 m/s^2