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  • 1. Balanced & unbalanced forces
    WALT: To calculate the resultant force acting on an object
    1st task… Name THREE forces and describe the effect of each force
  • 2. By the end of the lesson we…
    Must…
    Describe the effect of different forces
    Should…
    Explain the term ‘balanced forces’
    Could…
    Explain the term ‘unbalanced forces’
    Calculate the resultant force
  • 3. Balanced and unbalanced forces
    If two forces are acting on an object in opposite directions, the object will move in the direction of the larger force.
    If the two forces are the same size but in opposite directions, they balance out. These forces are called balanced forces.
    Video Clip
  • 4. 16 Newtons
    50 Newtons
    30 Newtons
    25 Newtons
    Unbalanced Forces
    300 Newtons
    100 Newtons
  • 5. Balanced Forces
  • 6. Balanced & unbalanced forces
    Pushes and _________ are forces.
    The force of gravity pulling towards the Earth is called ___________.
    An object placed in water has a force called ________ pushing up on it.
    When the forces acting on an object are equal and opposite, they are called ___________ ______.
    If the forces are balanced, the object will stay still or carry on at the same speed in the same direction.
  • 7. Quick Re-cap
    Switch on your Qwizdom handsets
  • 8. If two different forces are acting on an object in opposite directions, the object will:
    Stay in the same place
    Move in the direction of the larger force
    Move in the direction of the weaker force
  • 9. Enter the correct answer
    The forces on a person are _________
  • 10. Choose all that apply....If the forces are balanced an object will:
    Stay still
    Slow down
    Carry on at same speed in the same direction
  • 11. HOMEWORK
    Forces poster
    Your task…
    Produce a poster about what you have learnt so far about forces
    Level 3: Explain what forces are
    Give meanings and examples of forces, draw a force diagram e.g. of a fish
    Level 4: Explain balanced & unbalanced forces
    Explain what happens in a tug of war. How does a car keep at a steady speed? Draw force diagrams to help explain both
    Level 5: Explain what density is & how it is measured
    Draw a force diagram showing the forces acting on an object in water