Question

state the effect of couple

Answer 1

Answer:

A couple is always needed for starting rotation.

Explanation:

For example  opening a door

1. The force which we exert at the handle of the door
2. An equal an opposite force of reaction at the hinge

hope this helps you friend.

Answer 2

The effect of the couple is to generate rotation without any acceleration at the center of mass.

The couple is alternatively known as a pure moment which is different from torque. Torque is one of the special cases of the moment.

An example of a couple is the force exerted by our hands on a car's steering wheel, also the force exerted by our hands on a screwdriver.