Gravity

Force due to which a relatively small object is attracted towards the center of the larger objects like planets or satellites is known as gravity. In this note, you will learn about gravity along with its mathematical formulas.

Summary

Force due to which a relatively small object is attracted towards the center of the larger objects like planets or satellites is known as gravity. In this note, you will learn about gravity along with its mathematical formulas.

Things to Remember

  • Force due to which a relatively small object is attracted towards the center of the larger objects like planets or satellites is known as gravity.
  • The acceleration produced on a freely falling body under the effect of gravity is called acceleration due to gravity.

MCQs

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Subjective Questions

Q1:

What is a misil filing?


Type: Very_short Difficulty: Easy

Show/Hide Answer
Answer: <p>The systematic process of collection and preservation of all letters and documents relating to a particular case is called misil filing.</p>

Q2:

What is box filing?


Type: Very_short Difficulty: Easy

Show/Hide Answer
Answer: <p>The act of collecting and preserving the letters and documents of the temporary nature in a box in a loose position is known as box filing.</p>

Q3:

What is box filing? State the advantages of box filing.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>The act of collecting and preserving the letters and documents of the temporary nature in a box in a loose position is known as box filing. The following are the main advantages of box filing:</p> <ol><li>It is simple to understand and easy to operate.</li> <li>It is economical because one box is sufficient for filing the documents.</li> <li>It provides greater safety to the documents because the box always remains closed.</li> <li>It consumes less space as the box can be kept on a corner of the table or floor.</li> </ol>

Q4:

What is misil filing? What are the advantages of misil filing?


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>The systematic process of collection and preservation of all letters and documents relating to a particular case is called misil filing. The following are the main advantages of misil filing:</p> <ol><li>It is simple to understand and easy to operate.</li> <li>It provides the easy location of the particular misil because separate misil number is given for each case.</li> <li>It is economical because it does not require any guide card, drawer, and cabinet.</li> <li>It is flexible because unnecessary documents can be removed and new documents can be added easily.</li> </ol>

Q5:

What is misil filing? What are the disadvantages of misil filing?


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>The systematic process of collection and preservation of all letters and documents relating to a particular case is called misil filing. The following are the main disadvantages of misil filing:</p> <ol><li>It is unscientific, unsuitable and impractical to the offices other than courts.</li> <li>It consumes more time in punching and filing the documents.</li> <li>It is not the safe type of filing because the files are kept on the floor or open drawer or cabinet.</li> <li>It is not the convenient type of filing. It creates difficulty to add new documents and remove unnecessary ones because the documents are punched and tied together.</li> </ol>

Q6:

What is box filing? State its disadvantages.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>The act of collecting and preserving the letters and documents of the temporary nature in a box in a loose position is known as box filing. The following are the disadvantages of box filing:</p> <ol><li>It is not suitable for large and modern organizations.</li> <li>It is not flexible. Only a limited number of documents can be kept in a file.</li> <li>It is unsuitable for large sized valuable and permanent type of papers.</li> <li>It keeps documents loosely due to which there is a greater chance of misplacement of documents.</li> </ol>

Q7:

What is horizontal filing?


Type: Very_short Difficulty: Easy

Show/Hide Answer
Answer: <p>Horizontal filing is also known as flat filing. It is such type of filing under which the files or folders are kept in drawers in horizontal or sleeping position.</p>

Q8:

What is horizontal filing? What are its advantages?


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Horizontal filing is also known as flat filing. It is such type of filing under which the files or folders are kept in drawers in horizontal or sleeping position. The following are the main advantages of horizontal filing:</p> <ol><li>It is simple and can be operated even without special knowledge.</li> <li>It is an economical system as it requires fewer equipment and manpower.</li> <li>It ensures safety to the documents as they are punched and tied with lace or clip.</li> <li>It occupies less space because the folders are placed in sleeping position one upon another.</li> </ol><p></p>

Q9:

What is horizontal filing? What are its disadvantages?


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Horizontal filing is also known as flat filing. It is such type of filing under which the files or folders are kept in drawers in horizontal or sleeping position. The following are the main disadvantages of horizontal filing:</p> <ol><li>It is difficult to locate the required file due to their sleeping.</li> <li>It is more time consuming as it requires punching, arranging, fastening, and opening the lace or clip frequently.</li> <li>It is less flexible system because the file cannot hold a large number of documents.</li> <li>It has the chance of disappearing the words and figures due to the punching of documents.</li> </ol>

Q10:

What is vertical filing?


Type: Very_short Difficulty: Easy

Show/Hide Answer
Answer: <p>The act of keeping folders in a drawer in a standing position with the support of one another is called vertical filing.</p>

Q11:

What is vertical filing? What are its advantages?


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>The act of keeping folders in a drawer in a standing position with the support of one another is called vertical filing. The following are the main advantages of vertical filing:</p> <ol><li>It discloses the position of all the folders at a glance.</li> <li>It ensures the safety of documents as a special type of folder and drawer or cabinet is used.</li> <li>It is most suitable for huge organizations as a great number of documents can be kept in the folders.</li> <li>It can maintain secrecy because the drawer remains locked.</li> </ol>

Q12:

What is vertical filing? What are its disadvantages?


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>The act of keeping folders in a drawer in a standing position with the support of one another is called vertical filing. The following are the main disadvantages of vertical filing:</p> <ol><li>It consumes more space as the folders are kept in standing position and big cabinets are also needed.</li> <li>It is comparatively more expensive as the special type of folders and drawers are needed.</li> <li>It is not suitable for the small organization due to limited resources.</li> <li>It has the greater chance of misplacing the documents as they are kept in lose forms.</li> </ol>

Q13:

Differentiate between horizontal filing and vertical filing.


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>The difference between horizontal filing and vertical filing are as follows:</p> <table width="677"><tbody><tr><td> <p>Bases of differences</p> </td> <td> <p>Horizontal Filing</p> </td> <td> <p>Vertical Filing</p> </td> </tr><tr><td> <p>Position of folders</p> </td> <td> <p>It is a system under which folders are arranged in a horizontal position.</p> </td> <td> <p>It is a system under which folders are arranged in a vertical position.</p> </td> </tr><tr><td> <p>Position of papers</p> </td> <td> <p>It keeps papers in files by tying with lace or clip.</p> </td> <td> <p>It keeps papers in folders in loose position.</p> </td> </tr><tr><td> <p>Chances of losing documents</p> </td> <td> <p>It has less chance of losing documents because papers are tied together with a clip.</p> </td> <td> <p>It has a greater chance of losing documents because papers are kept in a loose position.</p> </td> </tr><tr><td> <p>Economy</p> </td> <td> <p>It is an economical system as only files are necessary for preserving papers.</p> </td> <td> <p>It is a costly system as it requires special folders, drawers and guide cards.</p> </td> </tr><tr><td> <p>Flexibility</p> </td> <td> <p>It is not flexible because the file cannot hold a large number of documents.</p> </td> <td> <p>It is flexible. Each folder has greater capacity to hold papers.</p> </td> </tr><tr><td> <p>Quick reference</p> </td> <td> <p>It does not provide quick reference to locate documents.</p> </td> <td> <p>It provides quick reference to locate documents.</p> </td> </tr><tr><td> <p>Protection</p> </td> <td> <p>It provides limited protections to papers as files are kept in an open drawer.</p> </td> <td> <p>It provides maximum protections to papers as files are kept in cabinets with lock.</p> </td> </tr><tr><td> <p>Suitability</p> </td> <td> <p>It is suitable for small as well as large offices.</p> </td> <td> <p>It is suitable only for large offices.</p> </td> </tr></tbody></table><p></p>

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Gravity

Gravity

It is the force due to which a relatively small object is attracted towards the center of the larger objects like planets or satellites.

Acceleration due to gravity

It is the acceleration produced on a freely falling object towards the center at any planet or satellite.

The value of acceleration due to gravity differs from planet to planet and satellite to satellite.

E.g.:

Acceleration due to gravity of the earth = 9.8m/s2

Acceleration due to gravity of the moon = 1.6 m/s2

Acceleration due to gravity of the Jupiter = 25 m/s2

Derive the relation g = \(\frac{GM}{r^2}\) where symbols have their own usual meanings.

OR

Prove that: g = \(\frac{GM}{r^2}\)

Let,

M = mass of the planet

R = radius of the related body

m = mass of falling body on the surface of planet or object.

F = Gravitational force of attraction between the two bodies

g = acceleration due to gravity.

From Newton's universal law of gravitation,

F= ------------- (i)

From Newton's second law of motion,

F = mg -------------- (ii)

From Eqn (i) and (ii) we get

mg =

g =

g =   --------------- (iii) 

Further g ∝   {when G and M are held constant}

 

The acceleration due to gravity on earth is 9.8 m/s means that the velocity of every falling body above the earth surface increases 9.8m/s in each second.

It is demonstrated by the following diagram.

https://lh5.googleusercontent.com/FSbUg5-KUIp9Cpuf9TUAsdgmQU0fv12jvku0PNEMqq2V9M5-06_XWZWrGAt6oB-5T-NU68mBwbSz63YzQzWZUkzmj9Tb4mgsljf5xnVGLo1NEBmTp1t_zLtNf1ey64bqj5siJfHgs6k

Differences between acceleration due to gravity (g) and gravitational constant (G)

Acceleration due gravity(g) Gravitational Constant(G)
The acceleration produced on a freely falling body under the effect of gravity is called acceleration due to gravity. The gravitational constant is defined as the force of attraction between two bodies each of unit masses kept at a unit distance.
It is a variable quantity. Its value changes from place to place. It is a constant quantity.

Differences between acceleration due to gravity and gravity

Acceleration due to gravity Gravity
The acceleration produced, on a freely falling body under the effect of gravity is called acceleration due to gravity Gravity is the force by which body is attracted towards the center of the earth or any other heavenly body
Its SI unit is Its SI unit is N
It is the effect of gravity. It is the cause of acceleration due to gravity.

Difference between gravity and gravitation

Gravity Gravitation
Gravity is the force by which body is attracted towards the center of the earth or any other heavenly body It is the force of attraction between two bodies
Its SI unit is N Its SI unit is

 

Lesson

Force

Subject

Science

Grade

Grade 10

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