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PHY 101 PHY 101 Past Questions Objective Question
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Question

Which of the following is a direct consequence of Newton's second law when the net external force on a system is zero?
Options
A The total energy of the system is constant.
B The total linear momentum of the system is constant.
Correct Answer
C The velocity of each part of the system is constant.
D The system must be at rest.
Correct Answer

Option B is the correct answer.

Detailed Explanation

From F = dp/dt, if the net external force F is zero, then dp/dt = 0, which means the total linear momentum p is constant. This is the law of conservation of linear momentum.

Hint

Consider what it means for the time derivative of momentum to be zero.

Question Info

Course: PHY 101
Topic: PHY 101 Past Questions
Type: Objective
Difficulty: Not specified
Question 471 of 1250
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