Motion in a Straight Line
Class 11 · Motion in a Straight Line
Free Fall
Drop a ball from any height — gravity arrow, v arrow, fall time, impact velocity.
Key Notes
01
Free fall is motion under gravity alone (ignoring air resistance).
02
Acceleration = g = 9.8 m/s² downward (≈10 m/s² for quick estimates).
03
From rest at height h: fall time t = √(2h/g); impact speed v = √(2gh).
04
Thrown up with speed u: max height = u²/(2g); time up = u/g; total flight = 2u/g.
Formulas
Fall time from rest
Time to fall height h.
Impact velocity
Speed just before hitting ground.
Important Points
Same g for all masses in vacuum (Galileo's principle).
Free Fall 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.