Designing a Door

Torque has to be taken into account in the design and creation of a door. Because the torque of a force is greater when it is applied along a larger distance from the axis of rotation (and therefore the force is more effective) door knobs are placed on the side opposite the door hinges.

Torque (cont)

The torque of a force is found using this simple formula:
T = Fd, which means that the torque equals the distance from the axis of rotation to the place where the force is applied (d) multiplied by the magnitude of the force (F). Maximizing the torque of a force has many real-world benefits, so being able to calculate it is beneficial.