First slide

Motion in a plane

Question

The minimum number of non coplanar forces that can keep a particle in equilibrium is

Difficult

A

1
B

2
C

3
D

4

Solution

If a number of vectors form a closed polygon (Co-planar or non-coplanar), their resultant must be non-coplanar and minimum number of vectors required to form a closed non-coplanar polygon is four

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