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Centre of gravity.
We know to act on every particle of a body so that its weight is actually distributed throughout the body. But a solid body has one point at which it can be supported by a single upward force. In other words,the whole weight of a body acts as though it is concentrated at a single point and this point is called the centre of gravity.
If you are asked to carry a heavy object in one hand, you automatically take it up at the centre of gravity. If it begins to tip, when you first take it up, you move your hand along the object to the centre of gravity. The location of the centre of gravity of a uniform body is known to depend on its size.
STABILITY A book lying on a table is expected to keep its position without any difficulty, as one knows it to be in a state of equilibrium.However, to make it stand on end is not easy at all.In the same way, a pencil will lie on the table without any tendency to tip over. With some difficulty one can make it stand on its unsharpened end but will not stand at all, alone, upon its sharp end
The stability of an object is measured by the amount of work to be required to make it a new position. The stability of an object is greatest when its centre of gravity is at the lowest level. That is why, to increase the stability of a motor-car, its designer tries to keep the centre of gravity as low as possible

Центр тяжести.
Мы знаем, как воздействовать на каждую частицу тела, так что ее вес распределяется по всему телу. Но у твердого тела есть одна точка, в которой оно может поддерживаться одной восходящей силой. Другими словами, весь вес тела действует так, как будто он сосредоточен в одной точке, и эта точка называется центром тяжести.
Если вас просят носить тяжелый предмет в одной руке, вы автоматически поднимаете его в центре тяжести. Если он начинает опрокидываться, когда вы впервые поднимаете его, вы перемещаете руку вдоль объекта к центру тяжести. Известно, что расположение центра тяжести однородного тела зависит от его размера.
СТАБИЛЬНОСТЬ Книга, лежащая на столе, как ожидается, сохранит свое положение без каких-либо трудностей, поскольку известно, что она находится в состоянии равновесия. Однако заставить ее встать дыбом совсем непросто. Точно так же карандаш будет лежать на столе без какой-либо тенденции опрокинуться. С некоторым трудом можно заставить его стоять на своем заостренном конце, но не стоять совсем на одном остром конце
Стабильность объекта измеряется количеством работы, которая требуется, чтобы сделать его новой позицией. Стабильность объекта является наибольшей, когда его центр тяжести находится на самом низком уровне. Поэтому, чтобы повысить устойчивость автомобиля, его конструктор старается удерживать центр тяжести как можно ниже.

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