Why is this the answer?

The answer is wheel because this clever riddle uses fun word pictures to describe something that moves us everywhere, every single day. This puzzle is tricky because it describes two different kinds of movement at the same time. Let us look at the first line of the riddle: "I go around in circles, but always straight ahead." This is the key to solving the riddle. First, think about the shape of a wheel, whether it is on a bicycle, a big family car, or even a little shopping cart at the store. A wheel is always a perfect circle! When the wheel is rolling, it is constantly spinning and going around and around in circles. That is what makes the object roll instead of slide. So, it is always going "around in circles." But here is the secret that solves the second half of the clue: even though the wheel is spinning in that circle motion, the whole bike or car is actually moving forward in a perfectly straight line, taking you from one place to the next. The rolling circle motion is what *creates* the straight motion that moves the vehicle across the road. The two ideas of circular spinning and straight travel work together to make the riddle's answer possible! The next clue is, "Never complain, no matter where I am led." This part reminds us that a wheel is an object, not a living person or a pet. It does not have feelings, a mouth, or a voice, so it can never complain, get tired, or get cross. When a driver steers a car, the wheels just go exactly where they are pointed. When you ride your scooter or pull a wagon, the wheels simply follow your command. They roll over smooth roads and bumpy dirt paths, doing their very important job without ever saying a single word about the long journey. Wheels are truly one of the most useful inventions in the world. They let us move heavy things easily and travel long distances very quickly, which is why the person who wrote this riddle thought they were so clever. The riddle is a wonderful way to remind us how amazing and hard-working a simple round wheel can be, always ready to take us on our next great adventure, without a single grumble.