Question

Which law of motion is also known as the Law of Acceleration?

• A. First
• B. Second
• C. Third
• D. Fourth

Hint:

Second law connects force and motion mathematically using \( F = ma \), making it the most practical law in problem-solving.

Answer 1

The Correct Option is B

Concept: Newton’s laws of motion describe the relationship between force and motion. The second law specifically relates force to acceleration.
Newton’s Second Law (Law of Acceleration): It states that the rate of change of momentum of a body is directly proportional to the applied force and occurs in the direction of the force. \[ F = ma \] where,
\( F \) = force
\( m \) = mass
\( a \) = acceleration
Explanation:
Greater force → greater acceleration.
For constant mass, acceleration is directly proportional to force.
Hence, it is called the Law of Acceleration.
\[ \boxed{\text{Answer: (B) Second Law}} \]

Answer 2

Each of Newton's laws of motion is centred on a different physical idea: rest and motion staying unchanged, the link between force and change of motion, and the pairing of forces between two bodies. Identifying which physical quantity each law is actually about points straight to the one called the Law of Acceleration.

1. First: This law is centred on inertia, the tendency of a body to resist any change in its state of rest or uniform motion. It does not by itself define or calculate acceleration; it only states that a force is required to produce any change at all.
2. Second: This law is centred squarely on acceleration itself. It quantifies exactly how much a given force changes a body's motion, expressed as \( F = ma \), where the acceleration \( a \) is directly proportional to the applied force \( F \) and inversely proportional to the mass \( m \). Because acceleration is the variable this law solves for and explains, it earns the name Law of Acceleration.
3. Third: This law is centred on the interaction between two separate bodies, stating that every action has an equal and opposite reaction. It concerns paired forces between objects rather than the acceleration of a single body.
4. Fourth: Newton described only three laws of motion, so there is no fourth law to consider here.

Since only the second law has acceleration as the quantity it directly defines and calculates, while the other laws are concerned with inertia or paired reaction forces, it is the one identified as the Law of Acceleration.

Therefore, the correct answer is Second.