Work, energy and power · कार्य, ऊर्जा और शक्ति
W = Fs, KE = ½mv², PE = mgh, P = W/t — practise with steps.
Work, energy and power games
Work, energy and power · कार्य, ऊर्जा और शक्ति
| Work | W = F × s (force × displacement in its direction); unit joule (J) |
|---|---|
| Kinetic energy | KE = ½ m v² (energy of motion) |
| Potential energy | PE = m g h (energy of position); g ≈ 9.8 m/s² (10 in many problems) |
| Power | P = W ÷ t; unit watt (W); 1 kW = 1000 W; 1 horsepower ≈ 746 W |
Conservation of energy: energy changes form but the total stays the same.
For Class 9 (NCERT Exploration 9, “Work, Energy, and Simple Machines”). All answers are computed by a program.
A one-page chart to stick on the wall, and a worksheet to practise.
Work, energy and power
W = Fs · KE = ½mv² · PE = mgh · P = W/t
kheloaurseekho.in — free charts, games and worksheets
Work, energy and power — worksheet
Name: ____________________ Class: ______ Date: __________
1. A 50 N force moves a cart 6 m. Work = ____
2. KE of 2 kg at 10 m/s = ____
3. PE of 5 kg at 4 m (g = 10) = ____
4. Power if 900 J in 3 s = ____
kheloaurseekho.in — free charts, games and worksheets
