To Study Law of Conservation of Angular Momentum and Its Application
To Study Law of Conservation of Angular Momentum and Its Application
To Study Law of Conservation of Angular Momentum and Its Application
5. Torque is defined as
= r x F = r F sin( ).
5. Another way of expressing the above equation is that
torque is the product of the magnitude of the force and
the perpendicular distance from the force to the axis of
rotation (i.e. the pivot point).
Let the force acting on an object be broken up into its tangential (Ftan)
and radial (Frad) components . (Note that the tangential component is
perpendicular to the moment arm, while the radial component is
parallel to the moment arm.) The radial component of the force has no
contribution to the torque because it passes through the pivot point. So,
it is only the tangential component of the force which affects torque
(since it is perpendicular to the line between the point of action of the
force and the pivot point).
•There may be more than one force acting on an object, and each
of these forces may act on different point on the object. Then,
each force will cause a torque. The net torque is the sum of the
individual torques.
Rotational Equilibrium is analogous to translational equilibrium,
where the sum of the forces are equal to zero. In rotational
equilibrium, the sum of the torques is equal to zero. In other
words, there is no net torque on the object.