Simple machines help hold houses together, keep doors open, and turn things. The names of three of the simple machines are the screw, the wedge, and the gear. There are more simple machines, but this essay will only talk about three.
The first simple machine is the screw. The screw helps hold houses and buildings together. I once built a toy boat which needed screws to hold the boat together. When someone turns the top of the screw with a screwdriver, it drives the screw into a hole which holds things together like wood. The second simple machine is the wedge. The wedge serves as door stops and as something to wedge pieces of wood apart. I lived in a house where the doors would not stay open so I used a door stop to keep the door open. If someone applies force to the flat end of the wedge, the pointy end would split the wood in half. The third and final simple machine is the gear, which can turn other gears, connecting rods, and camshafts. I like to ride a bike, and when I ride a bike, I turn the pedals, which turns the gear, which makes the bike move. When the gear is turned, the gear can rotate other gears, connecting rods, and camshafts which can do other things.
So as one can see, these simple machines helped hold things together, cut wood, and help machines operate by themselves. For me these simple machines help me hold my toys together, keep my door open, and help my bike move.