I.The vector sum of the three forces must equal zero.
Explanation:
An object is said in translational equilibrium when it is moving at constant velocity (note that the velocity can also be zero, so an object at rest is also in translational equilibrium).
Since the velocity is constant, this also means that the acceleration of the object is zero:
[tex]a=0[/tex]
According to Newton's second law, the net force on an object is equal to the product between its mass and its acceleration:
[tex]\sum F = ma[/tex]
where
[tex]\sum F[/tex] is the vector sum of the forces acting on the object
m is the mass of the object
a is its acceleration
For an object in translational equilibrium, [tex]a=0[/tex], and therefore
[tex]\sum F = 0[/tex]
Applied to this case, this means that
I.The vector sum of the three forces must equal zero.
Learn more about Newton's second law:
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