Question

what is couple and write its example​

Answer 1

$~~~~~~~~{\huge{\mathcal{\underline{underline {\star{Hey mate{\star}}}}}}}$$<b>$. In mechanics, a couple refers to two parallel forces that are equal in magnitude, opposite in sense and do not share a line of action. A better term is force couple or pure moment. Its effect is to create rotation without translation, or more generally without any acceleration of the centre of mass.

Answer 2

Two equal and opposite parallel forces, not acting along the same line, form a couple. A couple is always needed to produce a rotation. example- turning of a water tap, turning a steering wheel.