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
Q2:
What is box filing?
Type: Very_short Difficulty: Easy
Q3:
What is box filing? State the advantages of box filing.
Type: Short Difficulty: Easy
Q4:
What is misil filing? What are the advantages of misil filing?
Type: Short Difficulty: Easy
Q5:
What is misil filing? What are the disadvantages of misil filing?
Type: Short Difficulty: Easy
Q6:
What is box filing? State its disadvantages.
Type: Short Difficulty: Easy
Q7:
What is horizontal filing?
Type: Very_short Difficulty: Easy
Q8:
What is horizontal filing? What are its advantages?
Type: Short Difficulty: Easy
Q9:
What is horizontal filing? What are its disadvantages?
Type: Short Difficulty: Easy
Q10:
What is vertical filing?
Type: Very_short Difficulty: Easy
Q11:
What is vertical filing? What are its advantages?
Type: Short Difficulty: Easy
Q12:
What is vertical filing? What are its disadvantages?
Type: Short Difficulty: Easy
Q13:
Differentiate between horizontal filing and vertical filing.
Type: Short Difficulty: Easy
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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 =
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.
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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