Work, Energy and Power Class 11 Physics Notes – Formulas & Quick Revision

Work, Energy and Power mein work-energy theorem, conservation of energy aur collisions cover hote hain — numericals ka favourite chapter. Yahan aapko is chapter ke sabse important formulas aur quick revision points free milte hain — NCERT/CBSE syllabus ke hisaab se, boards aur JEE/NEET dono ke liye.

Important Formulas & Concepts — Work, Energy and Power

• W = F·s·cosθ
• Kinetic energy KE = ½mv² = p²/2m
• Work-energy theorem: W_net = ΔKE
• Potential energy: U = mgh; spring PE = ½kx²
• Power P = W/t = F·v
• Elastic collision (1D): v₁ = [(m₁−m₂)u₁ + 2m₂u₂]/(m₁+m₂)
• Coefficient of restitution e = (v₂−v₁)/(u₁−u₂)
• Vertical circle: v_min at top = √(gr); at bottom = √(5gr)

Quick Revision Points

• Conservative force ka W path par depend nahi karta (gravity, spring)
• Friction non-conservative hai — energy heat mein jati hai
• Perfectly inelastic collision mein KE loss maximum
• 1 HP = 746 W; 1 kWh = 3.6 × 10⁶ J
• Power = dW/dt = F·v — variable force mein calculus lagao

FAQ

Collisions JEE mein kaise puchte hain?

e (restitution), energy loss aur 2D collision variations — complete notes mein saare cases solved hain.

Kya derivations included hain?

Haan, work-energy theorem aur vertical circle ki full derivations PDF mein hain.

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