Asked/Added Questions From NCERT:

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

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

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

 It get Double 

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

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

 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

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

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

 Relative density = 

Density of substancesDensity of water 

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

Relative density has no units.

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

 It is used in

(i) designing ships

(ii) Submarines.

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

 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

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

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

Pressure= Thrust/Area.

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

 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

 The coin sinks as its density is greater than water. 

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

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

Force acting perpendicular to a surface is called thrust.

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

 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

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

 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

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