Definition of aspiration. 1  1a : a strong desire to achieve something high or great an aspiration to become famous âusually plural a young man with political/literary aspirationsb : an object of such desire An acting career is her aspiration.
Wheel and axle. The wheel and axle is one of six simple machines identified by Renaissance scientists drawing from Greek texts on technology. The wheel and axle consists of a wheel attached to a smaller axle so that these two parts rotate together in which a force is transferred from one to the other.
Another difference between rims and wheels is how they operate; a wheel is a round device that rotates to allow a vehicle or other heavy equipment to move. In the case of a car wheel, the wheel should include a rim, and a tire. To be able to rotate, wheels are connected in parallel pairs, through their center, by an axle. The rotating motion moves the vehicle forward or backward, depending on which direction the wheel rotates.