Wheels roll round and round so things move without dragging.
A round wheel glides along much more easily than a flat box. That is why wheels are on so many things we use.
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Skateboards have four little wheels underneath a wooden board.
A wheelbarrow has just one wheel to help carry heavy loads.
Roller skates let you glide along on wheels on your feet.
Shopping carts have wheels so they are easy to push around the shop.
People invented the wheel thousands of years ago, long before cars.