write a short note on invention of axles
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Answer:
The evidence suggests that small wagons or carts, likely drawn by cattle, were in use in Central Europe by this time in human history. ... The wheels were attached to both sides of the axle. Finally, the fixed axle was invented, wherein the axle did not turn but was solidly connected to the cart frame
An axle is a central shaft for a rotating wheel or gear.
On wheeled vehicles, the axle may be fixed to the wheels, rotating with them, or fixed to the vehicle, with the wheels rotating around the axle.
In the former case, bearings or bushings are provided at the mounting points where the axle is supported. In the latter case, a bearing or bushing sits inside a central hole in the wheel to allow the wheel or gear to rotate around the axle. Sometimes, especially on bicycles, the latter type axle is referred to as a spindle.