Physics
An athlete runs before long jump to get advantage on

Principle of moments
Moment of a force
Frictional force
Inertia of motion

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Physics
To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor

Should be in the form of a vertical rod
Should be made of a good conductor but can be of any shape
Should be made of a good conductor like copper with sharp-pointed edges
Can be of any shape

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