Torque is the tendency of force to rotate an object around its axis. Torque is the product of displacement and force i.e. T= r x F where T (torque vector), r (displacement vector) and F(force vector).
To increase the torque several times, increase the force on the body at the same time. If this is not possible, increase the length of the arm. Increasing the acute angle between the arm and the force vector will also increase the torque level. Please note that the maximum torque forms at the angle α = 90º. Maximum torque can be achieved when the force is perpendicular to the shoulder.
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A couple involves two forces applied on different directions with an equal magnitude. There are different kinds of couples and the simplest form is a “simple couple” which consist of two forces whose lines of action do not coincide with each other.
Couples are free vectors. They create rotation without acceleration of centre of the mass and their resulting moment is known as torque. So, this moment should not be confused by torque.
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