What is the SI unit of force?
Show answer & explanation
Correct answer: A
Explanation
Solution: The correct answer is Newton.
Explanation:
☛ The SI unit of force is the Newton (symbol: N), named in honour of Sir Isaac Newton.
☛ According to Newton's Second Law of Motion, force equals mass multiplied by acceleration (F = m × a).
☛ One Newton is defined as the amount of force required to accelerate an object of 1 kilogram mass at a rate of 1 metre per second squared (1 N = 1 kg·m/s²).
☛ Force is a vector quantity because it possesses both magnitude and direction.
Extra Exam-Relevant Facts:
☛ Dyne: The CGS unit of force is the dyne, where 1 Newton = 10⁵ Dynes.
☛ Joule: The SI unit of work and energy, defined as 1 Joule = 1 Newton-metre (N·m).
☛ Watt: The SI unit of power, representing the rate of energy transfer of 1 Joule per second (J/s).
☛ Pascal: The SI unit of pressure and stress, defined as 1 Pascal = 1 Newton per square metre (N/m²).
☛ Dimensional Formula: The dimensional formula of force is [M¹ L¹ T⁻²].
Important One-Liners for Upcoming Exams:
☛ What is the relation between Newton and Dyne? → 1 Newton = 10⁵ Dyne
☛ Which physical quantity is measured in Pascal? → Pressure and Stress
☛ What is the SI unit of work and energy? → Joule
☛ What is the dimensional formula of force? → [M¹ L¹ T⁻²]
☛ What is the SI unit of power? → Watt