Center of Mass
x_COM = Σmᵢxᵢ / Σmᵢ — drag 3 masses and watch the COM marker shift.
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Class 11 · Notes
System of Particles & COM— Notes, Formulas & Revision
Complete revision notes and formulas for System of Particles & COM (Class 11). Curated for JEE, NEET, AP Physics, SAT, and CUET. Tap any topic to open the live simulation and full PYQ set.
Motion of COM
v_COM is constant when F_ext = 0 — see COM move in a straight line despite collisions.
Notes coming soon — open the simulation for the live walkthrough.
Linear Momentum
p = mv — momentum scales linearly with velocity; KE scales quadratically.
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Impulse & Momentum
J = FΔt = Δp — before/after view with momentum change computed.
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Momentum Conservation (Explosion)
Stationary body explodes into two — m₁v₁ + m₂v₂ = 0 demonstrated live.
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Angular Momentum of a Particle
L = r × p = mr²ω — rotating ball with L vector (out of page).
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Rocket Propulsion
F_thrust = u(dm/dt) — rocket loses mass and gains velocity.
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System of Particles & COM on sciphylab (also known as SciPhy, SciPhy Lab, SciPhy Labs). Free physics revision for Class 11, JEE Mains, JEE Advanced, NEET UG, AP Physics 1/2/C, SAT Subject Physics, and CUET-UG.