Forces and Motion

• Speed examples


  • Fastest
  • Tennis serve
  • Cheetah
  • Horse galloping
  • City driving
  • Usain Bolt sprinting 100m
  • Snail
  • Slowest
• Speed


  Distance / time
• Speed units


  • km/h
  • m/s
• Speed tells us how far an object has travelled
• Velocity


  A vector (has a direction)
• Velocity


  Measures an object's rate
• Speed


  Distance travelled over time
• Velocity


  Final displacement over time taken
• Acceleration


  Change in velocity over time
• RED LINE


  1. Walk for 4 seconds

  2. Stay stationary for 3 seconds

  3. Walk back to starting point for 3 seconds
• BLUE LINE


  1. Don't stop

  2. Walking at a fast speed

  3. Don't return at the end
• Mass


  How much matter the objects contains
• Mass


  Measured in grams (g)
• Weight


  Gravity pulled on the object
• Weight


  Measured in Newtons
• Weight


  Measured in kilograms (kg) [1kg = 100g]