How can you design objects that won’t fall over? Lesson 13/21 Stability How can you design objects that won’t fall over? Starter: Which is most stable…why?

HOMEWORK I will take this in next wed 27th Feb

Which is most stable…why?

Glossary Line of Action = the line along which a force acts.

Look at this brick – when is it most stable? Demo a brick When it is stable it is in equilibrium

States of equilibrium (3) Stable equilibrium Unstable equilibrium Neutral equilibrium

Will any of these topple over?!

If I add in the line of action of the weight 3 2 If the line of action is outside the wheel base, the vehicle will topple. How can I stop tractor 2 falling ? 1

1) Lengthen the wheel base 3 2 1

2) Lower the centre of mass 3 2 Lower the centre of mass. 1

3 ….. Bolt it to the floor….. Practical? 2 1

Complete worksheet 13.1

Silence task – I want to take these in to mark !