explain briefly the role of the position of centre of gravity in( a) loading a ship (b) sitting or standing on the upper Deck of a bus and (c )making toys
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Answer:
will try to explain in the simplest of way without getting into the physics of motion, forces of Gravity, and centrifugal and centripetal forces and mass and angular motion..etc…etc… (Only one expectation, and that is .. It is understood that one understands what is ‘Centre of Gravity.)
Here goes..
Double-decker buses are very tall constructions on a very limited track width.
The stability of any vehicle depends on the location of of its centre of gravity. (i.e. the perpendicular from the center of gravity, if it falls between its track-width, the vehicle will be stable.)
Lower the Centre of Gravity, greater will be the stability when the vehicle is in motion.
Greater the height of the vehicle, higher up will be Centre of Gravity. This will make the vehicle still more unstable.
Now imagine a passenger standing on the top deck (instead of sitting). This will shift the Centre of Gravity still higher up, thereby making the vehicle still more unstable.
When the vehicle is on a road where its left side wheels are at a lower level than its right side wheels, i.e. it is tilted on its side, with a standing passenger on the upper deck, the higher center of gravity will cause the perpendicular from the Center of Gravity towards the center of the earth, to shift beyond the track width onto the side which has its wheels on the lower side of the tilt. Thus making the bus to topple over onto its side whose wheels are at the lower side.
This is not the only reason.
The topdeck standing passenger will sway outwards when the double-decker will turn.(On a Left turn, the standing passenger will sway towards the Right side of the bus)
This will cause the Centre of Gravity to move outwards (significantly more than the seated passenger) and away from the direction of the turn.
It will be moving away from the track-width of the double-decker.
Once the perpendicular from the center of gravity shifts beyond the track width, the vehicle will become unstable and topple on to its outer side. (If the vehicle is taking a Left turn, then it will topple onto its Right side and vice-versa)
This is the reason why no standing passengers are not allowed on the top deck of a double-decker bus.
Explanation: