Energy Transfer & Conversion
📋 What it is
Machines move energy around, converting it between forms — but always losing some to friction as heat.
🗣️ Coach says
Machines are energy movers. A drill converts electrical energy to spinning motion; a car converts fuel’s chemical energy to motion. Energy is never lost, but every machine wastes some as heat from FRICTION. That’s why machines get warm, and why reducing friction (oil, smooth parts) makes them more efficient.
🧠 Memory hook
Machines convert energy between forms; friction always wastes some as heat. Less friction = more efficient.
😂 Giggle
What did one gear say to the other?
"You really grind my teeth!"
😲 Whoa!
Friction is why you can’t build a machine that runs forever — a tiny bit of energy escapes as heat with every moving part, every single time.
✅ Quick check: Why do moving machines get warm and lose some energy?
Say your answer out loud first — then reveal.
Friction between moving parts converts some energy into waste heat — energy isn’t lost, just spread as heat.
Friction dissipates energy as heat.
🧪 Try it! (2 minutes)
Rub your hands together fast — the warmth is motion energy turning into heat by friction.