1. Moments Y9

2. Aims
Know that forces can cause objects to turn on a pivot and understand the principle of moments.

3. Explore
Find and record the balance positions for 2 100g masses. 3 values.
Find and record the balance positions for 1 100g masses and one 50g mass. 3 values
Left hand side
Right hand side
Mass/g
Distance from pivot /cm

4. Explain
What do you notice about the left hand side and right hand side?
Try this multiply the mass by the distance?

5. Moments
The moment of a force is the force (in Newtons) x The distance (m or cm)
The units are ???????
Nm or Ncm

6. The principle of moments
A system is in equilibrium (balanced) when the clockwise moments (right hand side) equal the anticlockwise moments (left hand side)

7. Extend
Predict an arrangement of three 100g masses that will be in equilibrium.
Test your prediction

8. Evaluation Levers worksheet Text book p192 q 4-7
Homework – Moments worksheet

9. Progress
Can you….
Identify pivot (fulcrum), effort and load for levers?
Calculate a moment and give the correct units?
Use the principle of moments to calculate an unknown value?