Impulse Momentum Theorem — the NEET Physics formula with its derivation, variables, validity constraints and worked solver.
Impulse-Momentum Theorem Applies to systems with constant mass in an inertial reference frame. If the force varies with time, F avg represents the time-averaged force. Start with Newton's Second Law: F = ma Substitute acceleration a = dv/dt Rearrange to F dt = m dv Integrate both sides: Integral(F dt) = Integral(m dv) Define Impulse J = Integral(F dt) and Momentum p = mv Result: J = delta p Mass must be constant (non-relativistic) Time interval must be non-negative Confusing Impulse (Force x Time) with Work (Force x Distance) Assuming force is always constant during the collision (using peak force instead of average force) Neglecting direction (vector nature) when calculating change in velocity (e.g., bouncing back)