Verified Solution • 2025–26 Session
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Q3.1: MOTION IN A PLANE Solutions — NCERT Physics - Part 1
⚠️ Common Exam Traps & Conceptual Pitfalls
Students often treat angular frequency ($\omega$) as a vector because it describes rotation, but it has only magnitude; the direction belongs to angular velocity (a vector pointing along the rotation axis). Remember: speed vs velocity and angular frequency vs angular velocity differ by the presence of direction.
State, for each of the following physical quantities, if it is a scalar or a vector: volume, mass, speed, acceleration, density, number of moles, velocity, angular frequency, displacement, angular velocity.
Step-by-Step Verified Solution
**Answer:** Scalar: Volume, mass, speed, density, number of moles, angular frequency. Vector: Acceleration, velocity, displacement, angular velocity.
**Step-by-Step Explanation:**
Scalars have only magnitude: volume, mass, speed, density, number of moles, angular frequency.
Vectors have both magnitude and direction: acceleration, velocity, displacement, angular velocity. [citation:1]
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