Motion in a Straight Line
Class 11 · Motion in a Straight Line
Relative Velocity (1D)
Switch reference frames — ground, A, B — and see velocities transform.
Key Notes
01
Velocity of A relative to B: v_AB = v_A − v_B.
02
If both move in same direction, relative velocity = difference.
03
If in opposite directions, relative velocity = sum.
04
Ground frame and moving frames give different values for the same motion.
Formulas
Relative velocity
Velocity of A as seen by B.
Important Points
v_AB = −v_BA always.
Relative Velocity (1D) notes from sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs, Physics Lab). Class 11 physics revision for JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT, and CUET-UG.