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In a system of particles, if the total external torque is zero, what can be said

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Question: In a system of particles, if the total external torque is zero, what can be said about the angular momentum of the system?

Options:

  1. It is constant
  2. It is increasing
  3. It is decreasing
  4. It is zero

Correct Answer: It is constant

Solution: 

If the total external torque acting on a system of particles is zero, the angular momentum of the system remains constant according to the conservation of angular momentum.

In a system of particles, if the total external torque is zero, what can be said

Practice Questions

Q1
In a system of particles, if the total external torque is zero, what can be said about the angular momentum of the system?
  1. It is constant
  2. It is increasing
  3. It is decreasing
  4. It is zero

Questions & Step-by-Step Solutions

In a system of particles, if the total external torque is zero, what can be said about the angular momentum of the system?
  • Step 1: Understand what torque is. Torque is a measure of how much a force acting on an object causes that object to rotate.
  • Step 2: Know what external torque means. External torque is the torque that comes from forces acting on the system from outside.
  • Step 3: Recognize the condition given in the question. The question states that the total external torque is zero.
  • Step 4: Learn about angular momentum. Angular momentum is a quantity that represents the rotational motion of a system.
  • Step 5: Understand the principle of conservation of angular momentum. This principle states that if no external torque acts on a system, the angular momentum of that system remains constant.
  • Step 6: Apply this principle to the question. Since the total external torque is zero, the angular momentum of the system does not change.
  • Conservation of Angular Momentum – When the total external torque on a system is zero, the angular momentum of that system does not change over time.
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