Advertisements
Advertisements
प्रश्न
Answer the following question.
Why do we need to know the center of mass of an object? For which objects, its position may differ from that of the center of gravity?
Advertisements
उत्तर
- Centre of the mass of an object allows us to apply Newton’s laws of motion to finite objects (objects of measurable size) by considering these objects as point objects.
- For objects in non–uniform gravitational field or whose size is comparable to that of the Earth (size at least few thousand km), the position of the centre of mass will differ than that of the centre of gravity.
APPEARS IN
संबंधित प्रश्न
Give an example of a non-contact force which is always of attractive nature
State a factor on which the position of the centre of gravity of a body depend? Explain your answer with an example.
What is the position of the centre of gravity of a cylinder?
At which point is the centre of gravity situated in a triangular lamina?
'The position of the centre of gravity of a body remains unchanged even when the body is deformed'.
The centre of gravity of a uniform ball is ______.
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.
A right-angled triangle cardboard piece is placed as shown in fig. 7. Redraw the diagram showing the relative position of the vertices of the triangle when it is suspended by a pin from the hole A. Explain why the position changes?
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.
What is Gravitational force? Give gravitational units of force.
Explain why One leans forward while climbing up a hill.
Explain why a tight rope-walker, often holds a long pole in his hands when in action.
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)
What is centre of gravity ?
Write about the experiment to find the centre of gravity of the irregularly shaped plate.
If mean radius of earth is R, its angular velocity is ro and the acceleration due to gravity at the surface of the earth is g, then the cube of the radius of the orbit of satellite will be ____________.
For regular shapes of the small body, which of the following statement is true?
A metal sphere is hanging from the ceiling of a vehicle. If the vehicle is moving along the horizontal road with uniform acceleration 'a' then the suspended thread of the sphere gets inclined to the vertical at an angle 'θ'. The value of acceleration 'a' is (g = acceleration due to gravity) ______.
When this triangular lamina is suspended freely from any one vertex, what is the moment of force produced by its own weight in its rest position?
In a non-uniform gravitational field, how does the Centre of Gravity relate to the Centre of Mass?
