Four forces are acting on a body. If the body doesn't change its position or shape, the forces:
must be of equal magnitude
must be in a single line
must be parallel & opposite
must add up to zero when taken as vectors
A
must be of equal magnitude
B
must be in a single line
C
must be parallel & opposite
D
must add up to zero when taken as vectors
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Solution
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As the body does not change its position or shape, it implies that the net external force acting on the body must be equal to zero since the body is in equilibrium or at rest. Thus the vector sum of the four forces acting on the body must be zero.
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