Which of the following statements is correct?
I. Momentum is a vector quantity.
II. Force is a scalar quantity.

Correct option is B

Ans.(B) Only I

Sol.

• Momentum is a vector quantity because it has both magnitude and direction. It is defined as:
  Momentum (p) = Mass (m) × Velocity (v)
  Since velocity is a vector quantity, momentum also follows vector addition rules and has a specific direction.

• Force is NOT a scalar quantity; it is a vector quantity. According to Newton’s Second Law:
  Force (F) = Mass (m) × Acceleration (a)
  Since acceleration is a vector, force also has both magnitude and direction, making it a vector quantity.

Thus, Statement I is correct (momentum is a vector), but Statement II is incorrect (force is not a scalar, it is a vector).

Information Booster:

• Vector quantities: Have both magnitude and direction (e.g., velocity, acceleration, force, momentum).
• Scalar quantities: Have only magnitude and no direction (e.g., mass, temperature, energy, time).
• Newton’s Second Law: States that force causes acceleration and is given by F = ma.
• Momentum conservation principle: In a closed system, total momentum before and after an event (like a collision) remains constant.
• Force is measured in Newtons (N), and momentum is measured in kg·m/s.