⚙ Wheels and Gears

Wheels — Roll, Don't Drag!

Wheels help things roll instead of drag along the ground. Rolling creates much less friction than dragging, so you need less force!

• 🚚 Cars and trucks — big wheels carry heavy loads
• 🚴 Bicycles — thin wheels go fast!
• 🛒 Shopping carts — small wheels carry your groceries

Gears — Wheels with Teeth!

Gears are wheels that have teeth around the edge. When two gears fit together, turning one gear makes the other gear turn too!

• ⚙ A big gear turning a small gear makes the small one spin faster.
• ⚙ A small gear turning a big gear makes the big one spin slower but with more power.

Bikes, clocks, and cars all use gears!