Consider a trolley (hand truck) which is used in a supermarket to hold objects. Which simple machines are a part of the trolley?
A lever and a wheel and axle
A trolley is a combination of a lever and a wheel and axle.
With the help of a lever, a heavy load can be moved, by applying a small force at one end of the trolley. Wheel and axle are used to convert the translatory motion to rolling so that the wheels roll and friction is reduced.