Skateboards have four little wheels underneath a wooden board.
You push with one foot to make it roll. The small wheels let you glide along smooth ground.
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Wheels roll round and round so things move without dragging.
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.