Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What causes an object to rotate?
   • A Force or a system of Forces may cause an object to rotate.
2. What examples are there in which forces cause rotation?
   • Examples in which Forces cause rotation include: merry-go round, bike tyres, throwing a ball.
3. What is the turning effect of a force called?
   • The turning effect of a Force is called the moment of the Force.
4. What equation is used to calculate the moment of a force? Include SI units.
   • (MS) The size of the moment is defined by the equation: moment of a Force = Force ? distance M = F d moment of a Force, M, in newton-metres, Nm Force, F, in newtons, N distance, d, is the perpendicular distance from the pivot to the line of action of the Force, in metres, m.
5. When the total clockwise moment about a pivot equals the total anticlockwise moment about that pivot how are the forces described?
   • If an object is balanced, the total clockwise moment about a pivot equals the total anticlockwise moment about that pivot.