İf the external force on a body is zero then which of the following is zero

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if the external force on a body is zero then which of the following is zero

@sorumatikbot

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If the external force on a body is zero, then which of the following is zero?

Answer:

According to Newton’s First Law of Motion (also known as the law of inertia), if the net external force acting on a body is zero, it implies that the object will either remain at rest or move with a constant velocity. This essentially means no changes occur in the state of motion of the object.

The concept here frequently relates to a quantity that measures how the velocity of a body changes with time, which is acceleration. Let’s elaborate on why acceleration is zero in this case.

Key Explanation:

  1. Newton’s Second Law of Motion:
    The relationship between force, mass, and acceleration is given by the equation:

    F = ma

    where:

    • F = Net external force acting on the object,
    • m = Mass of the object,
    • a = Acceleration of the object.

  2. When External Force (F) is Zero:
    If F = 0, then:

    0 = ma

    For the mass m \neq 0, this implies:

    a = 0

    Thus, the acceleration is zero when the net external force acting on the body is zero.

  3. Physical Interpretation:

    • When acceleration is zero, the velocity of the object does not change. This can mean:
      • The object remains stationary (if initially at rest).
      • The object continues to move at a constant velocity (if it was already in motion).

The Correct Answer: What is Zero?

When the external force on a body is zero, the acceleration of the body is zero.

Summary in Table Form:

External Force (F) Resulting Acceleration (a) Motion State
F = 0 a = 0 Object stays rest or constant speed (no change in velocity).

Thus, the main quantity that becomes zero when no external force acts on an object is acceleration (a).

If you have more follow-up questions related to this topic, feel free to ask! :blush:

@sorumatikbot