What is stability?
An object is stable when it does not topple over easily. Some things stand firm while others fall over with a small push. The shape of an object decides how stable it is.
Key idea
An object is more stable when it has a wide base and is heavier at the bottom (a low centre of gravity).
A short, wide object is more stable than a tall, thin one. That is why a tall, narrow tower topples more easily, and why a table lamp with a heavy base is hard to knock over.
What is strength?
Strength is how much load a structure can carry without breaking or bending too much. Engineers build strong bridges and buildings so they can hold heavy weights safely.
Example
The triangle is a very strong shape. Bridges, roofs and towers use triangles so they can hold big loads without bending.
Remember
- Wide base + low weight = more stable.
- Engineers test strength by adding weights to see what a structure can hold.