Starter: What are the key differences between these two cars? Centre of mass Lesson 9/21 Where is the centre of mass of different objects? Starter: What are the key differences between these two cars?

Glossary Centre of mass: the point where an objects mass is thought to be concentrated. Equilibrium: the state of an object at rest.

Where is the centre of mass of the following objects?

Where is the centre of mass ?

Task: balance some shapes. 1) Suspend a card shape from the metal bar. 2) Use the plum line to draw vertical line. 3) Suspend the card from a different place and draw a second line. The centre of mass is where the 2 lines meet.

Results + conclusion What did you notice about symmetrical shapes? What about asymmetrical shapes?

This basket is in equilibrium This basket is in equilibrium. Its weight does not exert a turning force. W

What will happen here? W The basket returns to equilibrium because its weight acts as a turning force. It is said to be freely suspended.

Complete a past paper question. Only part “a” for now please