Maharashtra Board Class 11 Physics — Flashcards for Quick Revision

A: A unit is a standard measure of any physical quantity that is internationally accepted for comparison. It provides a reference to express the magnitude of a quantity. Example: When we say the length o

A: 1. Length - metre (m) 2. Mass - kilogram (kg) 3. Time - second (s) 4. Temperature - kelvin (K) 5. Electric current - ampere (A) 6. Luminous intensity - candela (cd) 7. Amount of substance - mole (mol)

A: Fundamental quantities do not depend on other quantities for measurement. Examples: length, mass, time. Derived quantities depend on fundamental quantities and can be expressed in terms of them. Exam

A: Scalars are physical quantities that can be completely described by magnitude alone (e.g., mass, time, temperature). Vectors are physical quantities that need both magnitude and direction for complete

A: A unit vector is a vector having unit magnitude in a given direction. If M is a non-zero vector with magnitude M = |M|, then the unit vector along M is: û_M = M/M. The unit vectors along x, y, and z a

A: If two vectors describing the same physical quantity are represented in magnitude and direction by the two sides of a triangle taken in order, then their resultant is represented in magnitude and dire

A: **Displacement**: Vector quantity representing the shortest distance between initial and final positions with direction. **Path length**: Scalar quantity representing the actual distance traveled. **

A: **Average velocity** is the displacement divided by time interval. **Formula**: v_av = (r₂ - r₁)/(t₂ - t₁) = Δr/Δt In component form: v_av = ((x₂-x₁)/(t₂-t₁))î + ((y₂-y₁)/(t₂-t₁))ĵ **Note**: It's a

A: **Instantaneous velocity** is the velocity of an object at a specific instant of time. **Formula**: v = lim(Δt→0) Δr/Δt = dr/dt In components: v = (dx/dt)î + (dy/dt)ĵ **Direction**: Always tangent