Ace Chapter 4 Work, Energy and Power (New Course 2025-2026) with hsanotes.com notes – guaranteed 90+ marks in Punjab Board exams!
Why hsanotes.com notes?
- Super concise & exam-focused
- Key definitions highlighted
- All formulas boxed
- Easy solved MCQs, short questions, numericals
- Conceptual clarity points
- Diagrams included
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For students of: All Punjab Boards (BISE Lahore, Gujranwala, Multan, Faisalabad, Sargodha, Rawalpindi, DG Khan, Bahawalpur, Sahiwal) and top schools: Aitchison College, Lahore Grammar School, Beaconhouse, The City School, LACAS, Convent of Jesus & Mary, DPS Lahore, Garrison Academy, Bloomfield Hall, Sadiq Public School Bahawalpur.
Solved MCQs
- Work is scalar: Yes
- Work zero when θ=90°: Yes
Solved Short Questions
- Define work → Force × displacement in direction of force
- When is work zero? → F=0, d=0 or θ=90°
- Conservative force? → Work path-independent
- Non-conservative force? → Work path-dependent
- Variable force work? → Area under F-d graph
Solved Numerical Problems
- F=10 N, d=5 m, θ=0° → W=50 J
- Carry load horizontal → W=0 (θ=90°)
- Satellite orbit → W_gravity=0 (perpendicular)
- Stretch spring, F_max=20 N, x=0.1 m → W=½×20×0.1=1 J
- Lift m=10 kg, h=4 m → W=mgh=392 J
- Push F=50 N, d=10 m, θ=60° → W=50×10×0.5=250 J
- Spring k=200 N/m, x=0.05 m → W=½kx²=0.25 J
View full PDF for complete diagrams, tables, extra MCQs/shorts/numericals & long questions.
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