P2.6 FORCES IN ACTION

• • As well as causing objects to speed up, slow down, change direction and deform, forces can also cause objects to rotate
  • A system of forces can also do this
• • An example of a rotation caused by a force is on one side of a pivot (a fixed point that the object can rotate around)
  • This rotation can be clockwise or anticlockwise
• moment (Nm) = force (N) x distance (m)
• • The principle of moments states that:

  If an object is balanced, the total clockwise moment about a pivot equals the total anticlockwise moment about that pivot
• • Levers increase the size of a force acting on an object to make the object turn more easily
• what is mass?

  the measure of the amount of matter in an object

  measured in kilogram