CoM Momentum Collisions Test

Result

CoM Momentum Collisions Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following are not correct about centre of mass?

A
Centre of mass of a system of four particles in a plane must lie within the quadrilateral formed by the four particles.

B
Centre of mass and centre of gravity are synonymous in all situations.

C
In centre of mass frame momentum of a system is always zero.

D
Internal force may affect the motion of centre of mass.

Solution

Internal force does not change the motion of centre of mass.

If ''g'' varies, COG doesn't coincide with centre of mass.
Question 2
1 / -0

Statement-1 : Two bodies A and B are attracted towards each other due to gravitation. If A is much heavier than B, then the center of mass of the bodies moves towards A.

Statement-2 : The centre of mass depends upon mass distribution of a body or a system of bodies.

A
Statement-1 is true but Statement-2 is false.

B
Statement-1 is false but Statement-2 is true.

C
Both Statement-1 and Statement-2 are true and Statement-2 is not the correct explanation of Statement-1.

D
Both Statement-1 and Statement-2 are true and Statement-2 is the correct explanations of Statement-1.

Solution

The two bodies will move towards their common centre of mass. But the location of the centre of the mass will remain unchanged. Therefore, the center of mass will remain at rest with respect to A as well as B.