In kinematics (Class 9 and 11 Physics), understanding the difference between distance and displacement is crucial. A classic problem involves an object moving along a circular path of radius $r$.
Distance is a scalar quantity (path-dependent).
Displacement is a vector quantity (shortest straight-line path).
In circular motion, displacement can be zero, but distance will never be zero.
If the object starts at point A and travels all the way around the circle back to point A:
If the object travels exactly halfway around the circle (from point A to point B on the opposite side):
Using the Pythagorean theorem, the straight line connecting two points at a 90-degree angle on the circle is √(r² + r²) = r√2.
What is the Dimensional Formula of 'g' (Acceleration Due to Gravity)?
Learn the exact dimensional formula of small 'g' (Acceleration due to gravity) in physics. Understand why its dimension is identical to normal acceleration [L¹ T⁻²].
What is the Dimensional Formula of Magnetic Field (B)?
Learn the exact dimensional formula of the Magnetic Field (B) in physics. Understand the step-by-step derivation using the Lorentz Magnetic Force formula (F = qvB).
What is the Dimensional Formula of Electrical Resistance?
Learn the exact dimensional formula of Electrical Resistance in physics. Understand the step-by-step mathematical derivation using Ohm's Law (V = IR).
What are the Disadvantages of Friction?
Learn about the major disadvantages of friction in physics. Understand how it causes wear and tear, wastes energy, and generates unwanted heat in machines.
Displacement Current: Concept and Formula
Learn the concept and formula for Displacement Current (Id) in physics. Understand how Maxwell corrected Ampere's law using changing electric fields.
Turn this guide into revision flashcards, a practice exam, or an AI-generated podcast — free, no signup required.