ROTATIONAL MOTION MCQ Quiz: GKFix - Bridge of Knowledge - Page 488

Question 2436

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How does the law of conservation of linear momentum apply to an exploding projectile?

Momentum is lost due to heat and sound
Each fragment has more momentum than the original
The explosion creates new momentum
The total momentum before and after the explosion remains the same

Question 2437

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What happens to the velocity of the center of mass if the net external force on a system is zero?

It gradually decreases
It increases indefinitely
It changes direction randomly
It remains constant

Question 2438

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Why do internal forces not affect the motion of the center of mass?

They are too weak to have any effect
They only act for a short time
They are not real forces
They occur in action-reaction pairs and cancel each other out

Question 2439

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What does Eq. (6.17), dP/dt = F_ext, signify in the context of a system of particles?

Momentum is always zero in isolated systems
Internal forces can change total momentum
The center of mass never moves
The rate of change of total momentum equals the net external force

Question 2440

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How is the total linear momentum of a system of particles mathematically expressed?

P = (m₁ + m₂ + ... + mₙ)(v₁ + v₂ + ... + vₙ)
P = average velocity × smallest mass
P = sum of masses divided by sum of velocities
P = m₁v₁ + m₂v₂ + ... + mₙvₙ