The wedge is used to stop a door or cut trough other objects.
The screw is a wedge also it is used to go through wood and hold it in place.
The inclined plane is used to make loading the cart into the trailer in this case.
The lever is used in this case to allow the the water to flow out of the nozzle. Levers are also used for many other tasks in life.
The wheel and axle is used to move the cart from one area to another using effort, or the person pushing the cart.
The pully on the flag pole is used to raise the flag up onto the pole with effort, or the person pulling the other eng of the rope on the pully.
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