# GCSE Physics Unit 3 Revision (2)

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- Created by: Sam Groves
- Created on: 08-04-11 18:38

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**Balanced Moments and Stability**

**Balance is about whether the moments are equal**- If the anticlockwise moments are equal to the clockwise moments, then the object won't turn.
**Example 1:**- A boy who weighs 300N sits 2m from the pivot of a seesaw.
- If another boy who weighs 700N, where should he sit to balance the seesaw?
- For the seesaw to balance, the
**anticlockwise moments must be equal to the clockwise moments** - anticlockwise moment = clockwise moment
- 300 x 2 = 700 x y
- y = 0.86m
**Example 2:**- A 6m long steel girder weighing 1000N rests horizontally on a pole 1m from one end.
- What is the tension in a supporting cable attached…

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