Turning forces

The steelyard

The steelyard The steelyard is a weighing device which has been used since Roman times. It is particularly suitable for weighing objects which can be suspended from a hook, e.g., sacks of farm produce and car-cases of meat. It consists of a graduated steel rod pivoted near one end and balanced by a heavy piece of metal B (Fig. …

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The plumbline

The plumbline When a body is freely suspended by a string and is at rest the force of gravity on it, acting vertically downwards, is balanced by an equal and opposite force or tension in the string. Being flexible, the string therefore sets in a vertical direction. This is the principle of the plumbline, which consists of a …

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