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Class 11 Physics – Most V.V.I. Questions & Important Derivations for Exams

PHY1011 Physics class 11 · Tribhuwan University

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🔥 Prepare smarter for your Class 11 Physics exams! ⚡ Mechanics 🌡️ Heat & Thermodynamics 🔭 Optics ⚡ Electrostatics #Class11Physics #PhysicsNotes #NEB #Class11Notes #PhysicsDerivations #ExamPreparation #VVIQuestions #NepalStudents #StudyNotes #HandwrittenNotes

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6
Academic year
2025/2026
Language
English

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CLASS XI PHYSICS Most VVI. Exam Notes Handwritten - Easy to Revise MECHANICS HEAT & THERMODYNAMICS OPTICS ELECTROSTATICS Focus on definitions + derivations + formulas

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1. MECHANICS — V.VI. QUESTIONS 1) Parallelogram law of vector addition If two vectors acting at a point are represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant is represented by the diagonal through the common point. RB R=R(P?+ Q% + 2PQ cosR) ® tan B = Q sin® / (P + Q cos) 2) Resultant of two inclined vectors — derivation Resolve Q into components: Q cos& along P and Q sini perpendicular to P. B RM=P+Qcos® RX-=Q sink ® R?= RN? + RR? = P? + Q% + 2PQ cos® X fan B = R&/RK = Q sink/(P+Q cosk) 3) Triangle law of vector addition If two vectors are represented by two sides of a triangle taken in order, the third side taken in the opposite order represents their resultant. B R=Q(P°+Q%+ 2PQ cosk) 4) Projectile motion A projectile is a body projected into air with initial velocity and then moves under gravity alone (air resistance neglected). For horizontal projection from a tower: x = ut, y = %gt’. Eliminating t gives y = 9¢/(2u?), hence the path is a parabola. ® Impact angle: tan® = VR/WMR = gt/u For projection with speed u at angle &: ® H = u?sin®B/(2g) KT =2usink/g ® R= u?sin2®/g K Maximum range when ® = 45°

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