NLM

Centrifugal Force & Pseudo Forces in Rotating Reference Frames | JEE Physics Class 11

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Concept Card: Centrifugal Force & Pseudo Forces in Rotating Frames 1. Non-Inertial Frames & Origin of Pseudo Forces: In an inertial reference frame, Newton’s Second Law applies directly ($\sum \vec{F}_{\text{real}} = m\vec{a}$). In a non-inertial reference frame translating with acceleration $\vec{a}_0$, an observer must introduce a fictitious (pseudo) force to apply Newton’s laws: $$\vec{F}_{\text{pseudo}} = … Read more

Dynamics of Uniform Circular Motion: Centripetal Force & Banking of Roads | JEE Physics Class 11

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Concept Card: Dynamics of Uniform Circular Motion & Banking of Roads 1. Centripetal Acceleration & Centripetal Force ($F_c$): A particle of mass $m$ executing uniform circular motion of radius $r$ at speed $v$ (angular speed $\omega = \frac{v}{r}$) experiences a continuous inward radial acceleration: $a_c = \frac{v^2}{r} = \omega^2 r = v\omega$ By Newton’s Second … Read more

Friction in Mechanics: Static, Kinetic & Rolling Friction, Laws & Contact Forces | JEE Physics Class 11

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Concept Card: Friction in Mechanics – Static, Kinetic & Rolling Friction 1. Physical Origin and Nature of Frictional Forces: Friction is an electromagnetic contact interaction arising from microscopic surface irregularities (asperities) and cold-welding (intermolecular bonding) at real microscopic points of contact. – Real contact area ($A_{\text{real}}$) is a minute fraction of the macroscopic apparent area … Read more