Generally, it is easier to increase the distance between the object and the point where the force is applied, than to increase the force, so when human or animal power is not sufficient to complete a given task that involves rotation, people have been increasing the distance, often by using levers and other devices, to increase the torque. This property has been used by people for thousands of years. Because the resulting torque is affected by the magnitude and the direction of the force as well as the distance from the axis of rotation to the point of application of force, one can manipulate either the force or the distance to attain a certain amount of torque. When performing a specific task that involves rotating an object using force, one would need a given amount of torque. Forces F1 and F4 are not perpendicular to the line connecting the point of force application and the center of rotation, and because of this, the torque is reduced. Here the forces marked as F2, F3, and F5 are perpendicular to the line, which connects the point of the application of force and the center of the helm. Here F2, F3, and F5 produce the greatest torque. The torque is the greatest when the forces, acting upon an object are perpendicular to the line that connects the axis of rotation and the point of application of force. In essence, torque represents what combination of the magnitude of force and distance is needed and in what direction force needs to be applied to produce a given amount of rotation. In particular, if the force acting upon the lever is perpendicular to the lever, the torque is the strongest, and it decreases to zero as the direction of the force aligns with the lever. The force here is a vector, therefore even if its magnitude stays the same, it changes with the change of the angle between the direction at which the force is applied and the lever. Torque depends on the force and the distance between the axis of rotation of the object and the place where the force producing the rotation is applied. This inclination of objects to rotate under the influence of a force is torque. When force is applied to objects in a certain way, they rotate.
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