Question

1.
Position of centre of mass is not affected due to of the following
1) Any type of force
2) External forces
3) Internal forces
4) All the above
of mass of the
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Answer 1

Answer:

Internal forces....

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Answer 2

3)Internal forces

Explanation:

• The center of mass is a position defined relative to an object or system of objects.

• It is the average position of all the parts of the system, weighted according to their masses.

• Formula:

                                      $r_{COM}$ = $\frac{m_{1} r_{1} + m_{2}r_{2} +m_{3}r_{3} +.. }{m_{1} + m_{2}+m_{3}+... }$

where,

$r_{1}, r_{2}, r_{3}$ represents the positions of    $m_{1}, m_{2}, m_{3}$ respectively.

• From the above formula its clear that  position of center of mass does not depend on internal forces.

• However external forces affect the position of center of mass.

Eg - On applying heat energy to an iron rod and molding it into a                      sphere, its position of center of mass changes.

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