The Student Room Group
Original post by Marcos135
I found a definition here which states: "The turning effect caused by two equal and opposite forces when their line of actions are different"

Just to make sure, the forces are equal in magnitude but act in opposite directions right?

Reply 2
They have to be parallel too.
Reply 3
Original post by teachercol
They have to be parallel too.

Yes, true but I guess opposite directions automaticaly implies they must be parallel.
Reply 4
Not to examiners!
Original post by coolstorybrother

i found this def '' A couple is formed by two unlike parallel forces of the same magnitude but not along the same line ''