Very Short Question Answers

Q1. Why do we prefer a spanner of longer arm as compared to the spanner of shorter arm?

Ans.

Torque τ = 𝑟𝐹 sin 𝜃
In the case of a spanner of longer arm, length of the lever of force i.e. ‘𝑟’ is more, so torque
(τ) is more. Hence turning effect is more.
∴ spanner of longer arm is preferred. 

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