What are the different uses of torque
With the definition of the focus
The amount of torque D is defined as the product of the amount of force and the perpendicular distance a of the line of action to the pivot point:
The direction of the torque results from the position of the axis of rotation, i.e. stands up vertically and . The torque is thus generally a vector product of the distance vector and strength to indicate:
The torque is required to describe a rotational movement. If the line of action of force runs through the fulcrum, no rotation takes place (sina = 0). If the force is perpendicular to the radius vector, the drive is most effective.
If several forces act at different points, the torques add up vectorially:
A rotation does not take place if the sum of all applied torques disappears (torque set)
A body is in equilibrium with regard to rotation when the sum of all acting torques vanishes.
A body is in equilibrium with regard to translation when the sum of all acting forces vanishes.
If a body is suspended in the earth's gravitational field, gravity gdm acts on every mass element dm. The total effective torque results from:
Since g is a constant factor, it can be drawn in front of the integral (taking into account the commutation rule in the vector product):
the entire torque can be expressed by
The total torque results from the cross product of weight and a position vector that points from the axis of rotation to the center of gravity.
A body that is rotatably suspended in the earth's gravitational field behaves as if its entire weight were attacking the center of gravity. If a body is rotatably mounted directly in the center of gravity, the resulting torque is zero. In this case, there is no rotation under the influence of gravity in any position - the body is stable.
The law of leverage
A simple application of the torque set is with a two-armed lever (e.g. beam balance):
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