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प्रश्न
Define centre of gravity.
Define the term ‘centre of gravity of a body’.
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उत्तर १
उत्तर २
The centre of gravity is an imaginary location where the body’s whole weight is assumed to be concentrated.
संबंधित प्रश्न
What is the weight of a body placed at the centre of the earth?
A uniform flat circular rim is balanced on a sharp vertical nail by supporting it at point A, as shown in the figure. Mark the position of the centre of gravity of the rim in the diagram by the letter G.
Following Fig shows piece of cardboard of uniform thickness cut into different shapes. Draw two lines to indicate the position of centre of gravity G.
Following Fig shows piece of cardboard of uniform thickness cut into different shapes. Draw two lines to indicate the position of centre of gravity G.
Give scientific reason for the following:
It is easier to push a boy standing on one leg than on both legs.
Even though the Tower of Pisa is leaning through an angle it does not fall.
Give scientific reason for the following:
In a doubled decker bus passengers are not allowed to stand in the upper deck.
Explain why Standing passengers are not allowed on the upper deck of a double-decker bus.
Explain the term ‘centre of gravity’ of a body.
A boy of mass 40 kg runs up a height of 30 steps, each 20 cm high. Find:
(i) The force of gravity acting on the boy.
(ii) The work done by the boy against gravity. (Take g = 9.8 ms−2)
