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What is free fall of a body ?...

What is free fall of a body ?

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The motion of a body under the influence of gravity alone is called a free call.
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What is meant by free fall ?

The state of a freely falling body is

Assertion : A freely falling body is in the state of weightlessness Reason : A body becomes conscious of its weight only when it is opposed

An object of mass 10 kg is hanging on a spring scale which is attached to the roof of a lift. If the lift is in free fall, the reading in the spring scale is

Take a small stone. Hold it in your hand. We know that the force gravity due to the earth acts on each and every object. When we were holding the stone in our hand, the stone was experiencing this force, but it was balanced by a force that we were applying onn it in the opposite direction. As a result, the stone remained at rest. Once we release the stone from our hands the only force that acts onit is the gravitational force of the earth and the stone falls down under its influence. Whenever an object moves under the influence of the force of gravity alone, it is said to be falling freely. Thus the released stone is in a free fall. In free fall, the initial velocity of the object is zero and goes on increasing due to acceleration due to gravity of the earth. During free fall, the frictional force due to air opposes the motion of the object anda buoyant force also acts on the object. Thus, true free fall is posible only in vacuum. For a freely falling object, the velocity on reachign the earth and the time taken for it can be calculated by using Newton's eqwuations of motion. For free fall the initial velocity u=0 and the acceleration a=g . Thus, we can write the equations as v="gt",s=1/2"gt"^(2),v^(2)=2gs For calculating the motion of an object thrown upwards, acceleration is negative, i.e. in a direction opposite ot the velocity and is taken to be -g. The magnitude of g is the same but the velocity of the object decreases due to -ve acceleration. The moon and the artificial satellites are moving only under the influence of the gravitational field of the earth. Thus they are in free fall. What is free fall?

PREMIERS PUBLISHERS-GRAVITATION-OTHER IMPORTANT QUESTION & ANSWERS (VERY SHORT ANSWER QUESTION)
  1. Distinguish between the terms gravitation and gravity.

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  2. Distinguish between Geocentric model and Heliocentric model.

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  3. What is free fall of a body ?

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  4. What are the values of g and G at the centre of the earth?

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  5. Does the escape velocity depend on the location from where it is proje...

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  6. What is the maximum number of electrons in the 'n' th orbit?

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  7. Calculate the gravitational potential near the surface of the Earth.

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  8. Does the acceleration with which a body falls towards the centre of th...

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  9. Explain how the mass of the Earth can be estimated from the knowledge ...

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  10. On what factors the value of "g" at any place on the Earth depends?

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  11. What is the gravitational field strength of a planet where the weight ...

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  12. How much will be the weight of the object at the centre of the Earth?

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  13. At the centre of the earth, does a simple pendulum oscillate?

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  14. What is the use of measuring 'g' accurately on Earth surface?

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  15. What is satellite?

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  16. Draw a graph showing the variation of 'g' with distance from the centr...

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  17. Distinguish between natural and artificial satellite.

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  18. A satellite revolving around the earth loses height. What happens to i...

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  19. What is the relation between escape and orbital velocity?

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  20. State the condition for satellite to be geostationary.

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