Cement trucks carry wet cement.
The unit on the back of this truck is the mixer.
The mixer spins around to mix the cement.
Dump trucks carry trash and junk.
This dump truck is going to the city dump to unload the junk that is in the back of the truck.
There is a metal gate at the back of the dump truck. The driver opens the gate and raises the bed of the truck to unload the junk.
Golf carts are small vehicles with open sides.
Golfers drive them on golf courses.
Golf carts do not go very fast. It is illegal to drive them on most streets.