Probably you don't know

Why Worm gears are not reversible Worm gears are used in speed reducer  this drive has a worm(driving Shaft) and a worm wheel (driven wheel) The speed reduction ratio is about 300:3 rpm Why it is not reversible: Worm gear has more contact area than any other gears so it has more friction so it has been used as self locking mechanism. Due to this more friction worm gears are not reversible.

Which one win the race- solid and hollow cylinder Consider two cylinders of different metals, different diameters, and different in mass now take example   One is a copper metal and another one is aluminium  Now Consider  copper as mass M1 and aluminium as M2 and and also consider that mass of the copper is greater than the mass of the aluminium  And here diameters also varies now place them on a sliding plane and remove the barrier both cylinders will Start rolling in a pure rolling manner now which one wins the race  You might think the copper with heavier mass wins the race  but actually not, neither one wins  both will reach the point at same time now again repeat the task with material of different diameter and length  The results is neither one wins the race Finally take an one  hollow material and another one solid material now did the  same race here the result change hollow one lose the g...

Why Auto-rickshaw tyres are tilted  Many times we saw auto tyres are tilted slightly about 1-3° vertical it is called Camber  Camber is are three types 1.Positive Camber  2. Negative Camber 3.Neutral Camber When the auto-rickshaw is unloaded the tyres will look tilted when it is fully  loaded with passengers the tyre inclination will become straight. It also help to withstand heavy load during traction and avoid tyre wearing during running Negative Camber are used in off-road vehicle like tractor