Question

SYSTEMS OF PARTICLES AND ROTATIONAL MOTION

Then we need only three conditions to be satisfied for mechanical equilibrium. Two
of these conditions correspond to translational equilibrium; the sum of the components of the
forces along any two perpendicular axes in the
plane must be zero.
The third condition
corresponds to rotational equilibrium. The sum
of the components of the torques along any axis
perpendicular to the plane of the forces must
be zero.




Why only one condition corresponds to rotational equilibrium but 2 conditions for translation equilibrium?​

Answer 1

Answer:

MOTION

Then we need only three conditions to be satisfied for mechanical equilibrium. Two

of these conditions correspond to translational equilibrium; the sum of the components of the

forces along any two perpendicular axes in the

plane must be zero.

The third condition

corresponds to rotational equilibrium. The sum

of the components of the torques along any axis

perpendicular to the plane of the forces must

be zero.

Why only one condition corresponds to rotational equilibrium but 2 conditions for translation equilibrium?