Brian Mutembei

A pair of forces with equal magnitudes, opposite directions, anddifferent lines of action is called a “couple.” When a coupleacts on a rigid object, the couple produces a torque that does notdepend on the location of the axis. The drawing shows acouple acting on a tire wrench, each force being perpendicular tothe wrench. Determine an expression for the torque producedby the couple when the axis is perpendicular to the tire and passesthrough a) point A, b) point B and c) point C. Express youranswers in terms of the magnitude F of the force and the length Lof the wrench. answers: FL,FL,FL