Here are three simple machines that are commonly used in backyards:
Wheelbarrow - This is a type of lever. The wheel and axle allow for easier transportation of heavy items.
Shovel - This is a type of inclined plane. The flat, angled blade allows for easier digging and lifting of soil or other materials.
Garden shears - This is a type of lever. The handles act as levers to increase the force applied to the blades for easier cutting of branches and other materials.