Q. 95.0( 1 Vote )

# 100 coplanar forces each equal to 10N act on a body. Each force makes an angle π/50 with the preceding force. What is the resultant of the forces?

Answer :

Now the total angle covered by the 100 coplanar forces of 10 N each is given by:

Total Angle Covered =

The head of the last force vector joins the tail of the first vector. Thus this makes a regular polygon of 100 sides. For a regular polygon (that is a polygon having all sides equal) we will always have an equal and opposite pair of force.

For Example, consider a square as shown below:

This is a regular polygon of 4 sides having same force magnitude. Thus they would cancel each other.

Thus,

Now, consider a regular hexagon as shown below.

This is a regular polygon with six sides.

All forces have one force that is equal and opposite of it. Hence,

Similarly, our regular polygon of 100 sides also has .

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If |A|= 2 and |B| = 4, then match the relations in column I with the angle θ between A and B in column II

If |A| = 2 and |B| = 4, then match the relations in column I with the angle θ between A B and in column II.