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Asked/Added Questions From NCERT:


Question 1. Asked on :22 August 2019:10:57:32 AM

Which is more fundamental mass or weight of a body?

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

Mass is more fundamental than weight because the mass of a body remains constant while its weight changes from place to place due to change in the value of g.

-Answered by Akki chauhan On 22 August 2019:11:02:02 AM


Question 2. Asked on :22 August 2019:10:56:00 AM

 We cannot move finger without disturbing all stars. Why?

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

When we move our finger, the distance between the objects and our finger changes. Hence, the force of attraction changes, disturbing the entire universe, including the stars.

-Answered by Akki chauhan On 22 August 2019:11:03:48 AM


Question 3. Asked on :22 August 2019:10:54:47 AM

Earth is cotinuously pulling the moon towards its centre, still it does not fall to the earth. Why?

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

Gravitational force of attraction due to earth provides the centripetal force, which keeps the moon in orbit around the earth. More ever, this gravitational force acts perpendicular to the velocity of the moon.

-Answered by Akki chauhan On 22 August 2019:11:06:00 AM


Question 4. Asked on :22 August 2019:10:53:23 AM

If the density of planet is doubled without any change in its radius, how does g change on the planet?

-Added by Akki chauhan Science » Gravitation

Answer:

Master Purushottam

 It get Double 

-Answered by Master Purushottam On 22 August 2019:04:14:47 PM


Question 5. Asked on :22 August 2019:10:51:54 AM

 Is it possible to shield a body from gravitational effects?

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

No, it is not possible to shield a body from gravitational effects because gravitational interaction does not depend upon the nature of the intervening medium.

-Answered by Akki chauhan On 22 August 2019:11:09:15 AM


Question 6. Asked on :22 August 2019:10:50:32 AM

What is the ratio of the force of attraction between two bodies kept in air and the same distance apart in water?

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

 1:1, because the gravitational force does not depend on the nature of the medium.

-Answered by Akki chauhan On 22 August 2019:11:10:40 AM


Question 7. Asked on :22 August 2019:10:49:41 AM

Why is G called the universal law of gravitation constant?

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

This is because the value of G is same for any pair of the bodies in the universe. It does not depend on the nature of the medium between the two bodies or on the nature of the bodies themselves.

-Answered by Akki chauhan On 22 August 2019:11:11:27 AM


Question 8. Asked on :22 August 2019:10:47:04 AM

Why is the law of gravitaion called the universal law?

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

This is because of the fact that the law of gravitation holds good for any pair bodies in the universe whether microscopically small or astronomically large in size.

-Answered by Akki chauhan On 22 August 2019:10:47:52 AM


Question 9. Asked on :22 August 2019:10:22:18 AM

Relative density of a substances to its density.

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

 Relative density = 

Density of substancesDensity of water 

-Answered by Akki chauhan On 22 August 2019:10:28:03 AM


Question 10. Asked on :22 August 2019:10:21:38 AM

Give the S.I unit of relative density.

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

Relative density has no units.

-Answered by Akki chauhan On 22 August 2019:10:28:06 AM


Question 11. Asked on :22 August 2019:10:20:35 AM

Give two applications of Archimedes principle.

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

 It is used in

(i) designing ships

(ii) Submarines.

-Answered by Akki chauhan On 22 August 2019:10:28:11 AM


Question 12. Asked on :22 August 2019:10:18:49 AM

State Archimedes principle.

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

 Archimedes principal: When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid dispalced by it.

-Answered by Akki chauhan On 22 August 2019:10:28:14 AM


Question 13. Asked on :22 August 2019:10:16:43 AM

How does the density of fluid affect the magnitude of buoyancy acting on an object immersed in it?

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

Weight of fluid displaced = pgV Where p is the density. Hence, buoyant force increases with increasing density of fluid.

-Answered by Akki chauhan On 22 August 2019:10:28:17 AM


Question 14. Asked on :22 August 2019:10:13:13 AM

Why do buildings have wide foundation? 

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan
Buildings have wide foundations to reduce the pressure on ground. Since larger the area, Lesser will be the pressure.

-Answered by Akki chauhan On 22 August 2019:10:28:19 AM


Question 15. Asked on :22 August 2019:10:12:31 AM

How is pressure related to the thrust exerted on a surface?

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

Pressure= Thrust/Area.

-Answered by Akki chauhan On 22 August 2019:10:28:31 AM


Question 16. Asked on :22 August 2019:10:11:27 AM

 State and define SI unit of pressure.

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

 Pressure is defined as thrust per unit area .the unit of pressure 

is pascal. One pascal is the pressure exerted when 1N force acts as a surface area of 1m2.

-Answered by Akki chauhan On 22 August 2019:10:28:34 AM


Question 17. Asked on :22 August 2019:10:10:22 AM

A coins when placed on the surface of water. Give reason. 

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

 The coin sinks as its density is greater than water. 

-Answered by Akki chauhan On 22 August 2019:10:28:37 AM


Question 18. Asked on :22 August 2019:10:09:07 AM

State a condition for an object to float when place on the surface of water.

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

A body will float if its density is less than that of water.

-Answered by Akki chauhan On 22 August 2019:10:28:40 AM


Question 19. Asked on :22 August 2019:10:06:32 AM

Define Thrust.

-Added by Akki chauhan Science » Gravitation

Answer:

Akki chauhan

Force acting perpendicular to a surface is called thrust.

-Answered by Akki chauhan On 22 August 2019:10:44:28 AM


Question 20. Asked on :12 January 2019:05:37:15 PM

Difference between mass and weight?

  

-Added by khushi chauhan Science » Gravitation

Answer:

Master Purushottam

 Mass:-

1. We can measure of an object by its inertia. 

2. The total quantity of matter contained in an object is called mass of an object.

3. Mass of the object remains constant at all the places.

4. Measurement of mass is done by using a pan or beam balance.

5.Mass of a body cannot change even value of g is zero at any place.


Weight:-

1. Weight=mass ×acceleration 

2. The gravitational force by which earth attracts an object is called weight of the object.

3. Weight of the object is different at all different places.

4. Measurement of weight is done by using a spring balance. 

5. Weight of the object becomes zero if g is zero. 


-Answered by Master Purushottam On 22 August 2019:09:13:04 PM


Question 21. Asked on :12 January 2019:05:34:44 PM

 Difference between mass and weight?

-Added by khushi chauhan General Knowledge » Gravitation

Answer:

Master Purushottam

Mass:- 

1. We can measure mass of an object by its inertia.

2. The total quantity of matter contained in an object is called mass of an object.

3. Mass of the body remains constant at all places. 

4. Measurement of mass is done by using a pan or beam balance. 

5. Mass does not change even value of g is zero at any place.


Weight:-

1. Weight= mass × acceleration.

2. The gravitational force by which earth attracts an object is called weight of the object. 

3. Weight of the object is different at different places.

4. Measurement of weight is done by using a spring balance.

5. Weight of the object becomes zero if g is zero. 

-Answered by Master Purushottam On 22 August 2019:09:13:38 PM


Question 22. Asked on :12 January 2019:05:27:17 PM

 What is the relationship between G and g ?

-Added by Himanshi Verma Science » Gravitation

Answer:

Master Purushottam

 Gravitational Constant (G) :-

1. Its value is 6.6734×10-11 Nm2/Kg2.

2. Its value remains constant always and everywhere.

3. Its S.I unit is Nm2/kg2.

4. It is Scaler Quantity. 

 Gravitational acceleration (g):-

1. Its value is 9.8 m/s2.

2. Its value varies at different Places. 

3. Its unit is m/s2.

4. It is a vector Quantity.

-Answered by Master Purushottam On 22 August 2019:09:13:56 PM


Question 23. Asked on :09 January 2019:10:49:47 AM

Write the universal law of gravitation. 

-Added by Master Purushottam Science » Gravitation

Answer:

Harshita Rathore
 The law of gravitation states that the force of attraction between any two objects is proportional to the product of their masses and inversely proportional to the square of the distance between them. The law applies to objects anywhere in the universe. Such a law is said to be universal.

-Answered by Harshita Rathore On 25 August 2019:03:12:40 PM


 

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