ROTATIONAL MOTION MCQ Quiz: GKFix - Bridge of Knowledge - Page 487

Question 2431

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Why is the motion of the center of mass unaffected by internal forces during a collision?

Collisions are too fast to affect motion
The center of mass disappears temporarily
Internal forces are negligible
Internal forces cancel out due to Newton’s third law

Question 2432

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What is the effect of external forces on the total momentum of a system of particles?

They have no effect
They only affect individual particles
They always decrease momentum
They can change the total momentum

Question 2433

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How does an explosion in mid-air affect the total momentum of a projectile system?

Momentum increases due to chemical energy
Momentum is destroyed in the explosion
Each fragment has zero momentum
The total momentum remains unchanged if air resistance is neglected

Question 2434

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What is the significance of Eq. (6.15), P = MV?

It defines kinetic energy of the system
It calculates gravitational force
It describes rotational inertia
It links the total momentum of a system to the motion of its center of mass

Question 2435

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In the absence of external forces, how does the center of mass of a system move?

It accelerates randomly
It comes to rest
It follows a circular path
With constant velocity in a straight line