ICSE Class 10Physics
⏱️ 10 min readWork, Energy and Power
Work done is zero when displacement is perpendicular to force (e.g. centripetal force, satellite orbiting earth).; Work-Energy Theorem: Net work done on a body equals the change in its kinetic energy.
⚡ Essential Formula / LawCore Syllabus Rule
W = F × s × cos θ | P = W / t = F × v | Kinetic Energy = ½mv² | PE = mgh
🎯 High-Yield Syllabus Checkpoints
- 1Work done is zero when displacement is perpendicular to force (e.g. centripetal force, satellite orbiting earth).
- 2Work-Energy Theorem: Net work done on a body equals the change in its kinetic energy.
- 3Conservation of mechanical energy during free fall (PE + KE = constant).
🚨 Examiner Traps & Common Mistakes
⚠️ Common Student Pitfall
Confusing power (rate of doing work in Watts) with energy/work (capacity in Joules).
⚠️ Common Student Pitfall
Forgetting that 1 kWh = 3.6 × 10⁶ Joules (commercial electrical energy unit).
📚 Verified Technical Definitions
Work (Physics)
Work is said to be done when a force acts on an object and causes displacement in the direction of the force.
Spaced Repetition Protocol:
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