Question

why do we prefer to use a wrench with a long arm? (according to one mark give answer)​

Answer 1

Answer: Because it helps getting more grip

Explanation: The longer the arm will the better grip we can get because the  size of the handle increases and our hands fit freely on it.

P.s. If the handle is long it can make the wrench heavy too.

Answer 2

Answer:

Explanation:

Torque or turning effect due to a force is maximum when r is maximum. We prefer to use a wrench with long arm because when the length of the arm(r) is long, the force (F) required to produce a given turning effect ( x ) is smaller. Hence, a nut can be unscrewed easily.