The wheel and axle will always rotate at the same speed. Due to the bigger circumference of the
wheel, the surface of the wheel will turn at a greater speed – and with a greater distance too.
Placing a load on a wheeled vehicle almost always reduces friction compared to dragging it over
the ground. Wheels in science and engineering are not always used for transport. Wheels with
grooves are called pulleys and wheels with teeth are called gears.
Common examples of wheels and axles are rolling pins, roller skates and pushcarts.