When a body is in equilibrium, which of the following must be true ?
There is no force acting on it.
The sum of all the forces acting on it must be zero.
The sum of all the forces acting on it is not equal to zero.
There are exactly two forces acting on the body.
A
The sum of all the forces acting on it is not equal to zero.
B
There are exactly two forces acting on the body.
C
There is no force acting on it.
D
The sum of all the forces acting on it must be zero.
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Solution
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A body is in equilibrium only when there is no net external force acting on it. So, in other words, the sum of all forces acting on it must be zero for a body to be in equilibrium.
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