CBSE Class 9 Science Gravitation Assignment Set 01

Class 9 Science Practice Assignments: CBSE Class 9 Science Gravitation Assignment Set 01

Access comprehensive school assignments for Chapter 9 Gravitation using the CBSE Class 9 Science Gravitation Assignment Set 01. Designed to align with the 2026-27 CBSE academic guidelines, these practice sets help Class 9 Science students reinforce core concepts and improve their problem-solving accuracy.

Download Chapter 9 Gravitation Assignment PDF with Solutions

Access the complete assignment PDF for Class 9 Science below. Regular practice with these targeted academic tasks builds familiarity with standard question patterns and helps secure higher marks in final school evaluations.

Question : State the universal law of gravitation
Answer :  The universal law of gravitation states that every object in the universe attracts every other object with a force called the gravitational force. The force acting between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
For two objects of masses m1 and m2 and the distance between them r, the force (F) of attraction acting between them is given by the universal law of gravitation as:
F = Gm1m2/r2
Where, G is the universal gravitation constant and its value is 6.67 × 10−11 Nm2kg−2.
 
Question : Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.
Answer :  Let ME be the mass of the Earth and m be the mass of an object on its surface. If R is the radius of the Earth, then according to the universal law of gravitation, the gravitational force (F) acting between the Earth and the object is given by the relation:
F = GMEm R2
 
Question : What do you mean by free fall?
Answer :  Gravity of the Earth attracts every object towards its centre. When an object is released from a height, it falls towards the surface of the Earth under the influence of gravitational force. The motion of the object is said to have free fall.
 
Question : What do you mean by acceleration due to gravity?
Answer :  When an object falls towards the ground from a height, then its velocity changes during the fall. This changing velocity produces acceleration in the object. This acceleration is known as acceleration due to gravity (g). Its value is given by 9.8 m/s2.
 
Question : What are the differences between the mass of an object and its weight?
Answer :
A-20
 
Question : Why is the weight of an object on the moon 1/6 th its weight on the earth?
Answer : Let ME be the mass of the Earth and m be an object on the surface of the Earth.
Let RE be the radius of the Earth. According to the universal law of gravitation, weight WE of the object on the surface of the Earth is given by,
WE = GMEm / RE2 
Let MM and RM be the mass and radius of the moon. Then, according to the universal law of gravitation, weight WM of the object on the surface of the moon is given by:
A-21
 
Question : Why is it difficult to hold a school bag having a strap made of a thin and strong string?
Answer :  It is difficult to hold a school bag having a thin strap because the pressure on the shoulders is quite large. This is because the pressure is inversely proportional to the surface area on which the force acts. The smaller is the surface area; the larger will be the pressure on the surface. In the case of a thin strap, the contact surface area is very small. Hence, the pressure exerted on the shoulder is very large.
 
Question : What do you mean by buoyancy?
Answer :  The upward force exerted by a liquid on an object immersed in it is known as buoyancy. When you try to immerse an object in water, then you can feel an upward force exerted on the object, which increases as you push the object deeper into water.
 
Question : Why does an object float or sink when placed on the surface of water?
Answer :  If the density of an object is more than the density of the liquid, then it sinks in the liquid. This is because the buoyant force acting on the object is less than the force of gravity. On the other hand, if the density of the object is less than thedensity of the liquid, then it floats on the surface of the liquid. This is because the buoyant force acting on the object is greater than the force of gravity.
 
Question : You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg?
Answer :  When you weigh your body, an upward force acts on it. This upward force is the buoyant force. As a result, the body gets pushed slightly upwards, causing the weighing machine to show a reading less than the actual value.
 
Question : You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?
Answer :  The bag of cotton is heavier than iron bar. This is because the surface area of the cotton bag is larger than the iron bar. Hence, more buoyant force acts on the bag than that on an iron bar. This makes the cotton bag lighter than its actual value. For this reason, the iron bar and the bag of cotton show the same mass on the weighing machine, but actually the mass of the cotton bag is more than that of the iron bar.
 

Exercises

 
Question : How does the force of gravitation between two objects change when the distance between them is reduced to half?
Answer :  According to the universal law of gravitation, gravitational force (F) acting between two objects is inversely proportional to the square of the distance (r) between them, i.e.,
F ∝  1/r2
If distance r becomes r/2, then the gravitational force will be proportional to 1/(r/2)2 = 4/ r2 Hence, if the distance is reduced to half, then the gravitational force becomes four times larger than the previous value. 
 
Question : Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
Answer :  All objects fall on ground with constant acceleration, called acceleration due to gravity (in the absence of air resistances). It is constant and does not depend upon the mass of an object. Hence, heavy objects do not fall faster than light objects.
 
Question : What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6 × 1024 kg and radius of the earth is 6.4 × 106 m).
Answer :  According to the universal law of gravitation, gravitational force exerted on an object of mass m is given by
F = GMm/ r2
Where,
Mass of Earth, M = 6 × 1024 kg
Mass of object, m = 1 kg
Universal gravitational constant, G = 6.7 × 10−11 Nm2 kg−2
Since the object is on the surface of the Earth,
r = radius of the Earth (R)
r = R = 6.4 × 106 m
Therefore, the gravitational force
 A-22
 
 
Question : The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? Why?
Answer :  According to the universal law of gravitation, two objects attract each other with equal force, but in opposite directions. The Earth attracts the moon with an equal force with which the moon attracts the earth.
 
Question : If the moon attracts the earth, why does the earth not move towards the moon?
Answer :  The Earth and the moon experience equal gravitational forces from each other. However, the mass of the Earth is much larger than the mass of the moon. Hence, it accelerates at a rate lesser than the acceleration rate of the moon towards the Earth. For this reason, the Earth does not move towards the moon.
 
Question : What happens to the force between two objects, if
(i) the mass of one object is doubled?
(ii) the distance between the objects is doubled and tripled?
(iii) the masses of both objects are doubled?
Answer : According to the universal law of gravitation, the force of gravitation between two objects is given by F = GMm / r2
 
(i) F is directly proportional to the masses of the objects. If the mass of one object is doubled, then the gravitational force will also get doubled.
(ii) F is inversely proportional to the square of the distances between the objects.
If the distance is doubled, then the gravitational force becomes one-fourth of its original value.
Similarly, if the distance is tripled, then the gravitational force becomes one-ninth of its original value.
(iii) F is directly proportional to the product of masses of the objects. If the masses of both the objects are doubled, then the gravitational force becomes four times the original value.
 
Question : What is the importance of universal law of gravitation?
Answer :  The universal law of gravitation proves that every object in the universe attracts every other object.
 
Question : What is the acceleration of free fall?
Answer :  When objects fall towards the Earth under the effect of gravitational force alone, then they are said to be in free fall. Acceleration of free fall is 9.8 ms−2, which is constant for all objects (irrespective of their masses).
 
Question : What do we call the gravitational force between the Earth and an object?
Answer :  Gravitational force between the earth and an object is known as the weight of the object.
 
Question : Amit buys few grams of gold at the poles as per the instruction of one of his friends. He hands over the same when he meets him at the equator. Will the friend agree with the weight of gold bought? If not, why? [Hint: The value of g is greater at the poles than at the equator].
Answer :  Weight of a body on the Earth is given by W = mg
Where,
m = Mass of the body
g = Acceleration due to gravity
The value of g is greater at poles than at the equator. Therefore, gold at the equator weighs less than at the poles. Hence, Amit’s friend will not agree with the weight of the gold bought.
 
Question : Why will a sheet of paper fall slower than one that is crumpled into a ball?
Answer :  When a sheet of paper is crumbled into a ball, then its density increases. Hence, resistance to its motion through the air decreases and it falls faster than the sheet of paper.   
 
Question : Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth = 6 × 1024 kg and of the Sun = 2 × 1030 kg. The average distance between the two is 1.5 × 1011 m.
Answer :  According to the universal law of gravitation, the force of attraction between the Earth and the Sun is given by
A-23
 
Question : A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25 m/s. Calculate when and where the two stones will meet.
Answer :  Let the two stones meet after a time t.
When the stone dropped from the tower
Initial velocity, u = 0 m/s
Let the displacement of the stone in time t from the top of the tower be s.
Acceleration due to gravity, g = 9.8 ms−2
From the equation of motion,
s = ut+ 1/2 at2
A-24
 
s' + s = 100
⇒ 25t − 4.9t2 + 4.9t2 = 100
⇒ t = 100/25
s = 4s
In 4 s,  The falling stone has covered a distance given by (1) as s = 4.9 × 42 = 78.4 m
Therefore, the stones will meet after 4 s at a height (100 – 78.4) = 20.6 m from the ground.  
 
Question : A ball thrown up vertically returns to the thrower after 6 s. Find
(a) the velocity with which it was thrown up,
(b) the maximum height it reaches, and
(c) its position after 4 s.
Answer :  (a) Time of ascent is equal to the time of descent. The ball takes a total of 6 s for its upward and downward journey.
Hence, it has taken 3 s to attain the maximum height.
Final velocity of the ball at the maximum height, v = 0 m/s
Acceleration due to gravity, g = −9.8 ms−2
Using equation of motion, v = u + at, we have
0 = u + (−9.8 × 3)
⇒ u = 9.8 × 3 = 29.4 m/s
Hence, the ball was thrown upwards with a velocity of 29.4 m/s.
 
(b) Let the maximum height attained by the ball be h.
Initial velocity during the upward journey, u = 29.4 m/s
Final velocity, v = 0 m/s
Acceleration due to gravity, g = −9.8 ms−2
A-25
 
Question : In what direction does the buoyant force on an object immersed in a liquid act?
Answer :  An object immersed in a liquid experiences buoyant force in the upward direction.
 
Question : Why does a block of plastic released under water come up to the surface of water?
Answer :  Two forces act on an object immersed in water. One is the gravitational force, which pulls the object downwards, and the other is the buoyant force, which pushes the object upwards. If the upward buoyant force is greater than the downward gravitational force, then the object comes up to the surface of the water as soon as it is released within water. Due to this reason, a block of plastic released under water comes up to the surface of the water.
 
Question : The volume of 50 g of a substance is 20 cm3. If the density of water is 1 g cm−3, will the substance float or sink?
Answer :  If the density of an object is more than the density of a liquid, then it sinks in the liquid. On the other hand, if the density of an object is less than the density of a liquid, then it floats on the surface of the liquid.
Here, density of the substance = Mass of the substance / Volume of the substance = 50/ 20 = 2.5 g/cm3
The density of the substance is more than the density of water (1 g cm−3).
Hence, the substance will sink in water.
 
Question : The volume of a 500 g sealed packet is 350 cm3. Will the packet float or sink in water if the density of water is 1 g cm−3? What will be the mass of the water displaced by this packet?
Answer :  Density of the 500 g sealed packet =  Mass of the packet / Volume of packet = 500/ 350 = 1.428 g/cm3
The density of the substance is more than the density of water (1 g/cm3). Hence, it will sink in water.
The mass of water displaced by the packet is equal to the volume of the packet, i.e., 350 g.  
 

 Exam Questions NCERT Class 9 Science Chapter 09 Gravitation

Question : The gravitational force acts on all objects in proportion to their masses. Why, then, a heavy object does not fall faster than a light object?
Answer :  Acceleration due to gravity does not depend on mass of object. Hence, all bodies fall with the same acceleration provided there is no air or other resistance.

Question : How can a person lie on a bed of nails without getting hurt?
Answer :  Weight is spread out over them all making the pressure on each individual nail just about equal to a pinch if there are many nails. The greater the number of nails the lesser will be the pressure per square inch. If there are a large number of nails, it will be almost like lying on a solid surface.

Question : Why is G called ‘a universal gravitational constant’?
Answer :  The value of G is same for any pair of objects in the universe. Also its value does not depend on the nature of the intervening medium. That is why constant G is called ‘universal gravitational constant’.

Question : Why should we be sent flying in space if the force of gravity somehow vanishes today?
Answer :  The centripetal force required to keep us rotating along with the Earth would not be available in the absence of force of gravity. We would then fly off along the tangent to the Earth into the space.

Question : Explain : Centrifugal force and Centripetal force.
Answer :  A force which is required to move a body uniformly in a circle is known as centripetal force. This force acts along the radius and towards the centre of the circle, centrifugal force arises when a body is moving actually along a circular path, by virtue of tendency of the body to regain its natural straight line path. This force acts along the radius and away from the centre of the circle.

Question : Discuss the variation of weight of a body with the Latitude of Earth and Altitude of Earth.
Answer :
(i) Earth is not a perfect sphere.
(ii) Its radius at equator is longer than at the poles.
(iii) The acceleration due to gravity is inversely proportional to the square of the radius.
(iv) Therefore, the value of “g” at the poles is higher than that at the equator.
(v) As a result, the weight of an object increases if it moves from the equator to the poles.

Mark (1)

Q 1 Name the force due to which a body performs circular motion.

Q 2 What is the nature of gravitational force?

Q 3 What is the numerical value of gravitational constant?

Q 4 Define thurst.

Q 5 Name the force experienced by the body when it is immersed in a liquid.

Q 6 What do you mean by the weight of the body?

Q 7 What is the acceleration of free fall?

Q 8 What is the weight of an object on moon?

Q 9 Why the cutting edge of a knife should be as sharp as possible?

Q 10 Iron nails sinks in water.Why?

Q 11 Explain, why the value of ‗g‘ is greater at poles than at equator.

Q 12 Why does a truck or motor-bus has much wider tyres?

Q 13 What do you mean by force of buoyancy?

Q 14 State Archimedes‘ principle.

Q 15 The density of gold is 19.3 x 103 kg/m3. Find its relative density.

Q 16 Give any two applications of Archimedes principle.

Q 17 What is a hydrometer? What is the principle of hydrometer?
 

Mark (2)

Q 18 Explain why moon moves around earth.

Q 19 A stone is dropped from the top of a building of height 45 m. Calculate its velocity , when it srtikes the ground.(Take g=10 m/s2)

Q 20 A body is thrown up with a velocity of 29.4m/sec.Find the time taken by the body to reach its highest point? After how much
time the body will come back on the ground?

Q 21 If the earth attracts an apple, why does not an apple attracts the earth ?

Q 22 A sheet of paper fall slower than the one that is crumpled into ball. Why?

Q 23 The mass of Seema is 45kg. What will be her weight on the surface of the earth? What will be her weight on the surface of the
moon?

Q 24 Why fluid exert pressure ?How is the pressure transmitted in a fluid?

Q 25 State the importance of the universal law of gravitation.

Q 26 State Newton‘s Law of Gravitation. Why Newton‘s Law of Gravitation is known as Universal Law of Gravitation?

Q 27 What are two main factors on which the buoyant force depends?

Q 28 Why does an iron nail sink in water but a wooden cork float on water?

Q 29 An object of volume V is immersed in a liquid of density .P Calculate the magnitude of buoyant force acting on the objet due to
liquid.

Q 30 What is buoyant force? Write any two applications of Archimedes principle.

Q 31 A student immerses a block into different liquids. Is the buoyant force acting on the block same for all the liquids?

Q 32 A plastic ball is released under water. It comes to the surface of the water and doesn‘t sinks in it. Explain the reason.

Q 33 Define pressure. A force of 200 N is applied on an object of area 10 m2. Find the pressure exerted on the body.

Q 34 Why are the straps of school bags made wider?

Q 35 What are the factors that affect buoyant force exerted by a liquid on a solid when it is immersed in the liquid?

Q 36 In what direction does the buoyant force on an object due to a liquid act? What is the relation of buoyant force with the density
of a fluid?

Q 37 Does Archimedes principle hold true for a satellite moving in a circular orbit? Explain.

Q 38 Mohan threw a pointed dart (arrow) at the dartboard. It stuck to the board, but when he threw a blunt dart, it fell down after
hitting the board. Why?

Q 39 An object is immersed in different liquids. Is same buoyant force acts on an object due to all liquids?

Q 40 A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate
(a) The maximum height to which it reaches
(b) The total time it takes to return to the surface of the earth

Marks (3)

Q 41 What is the force of gravitation between the earth and the sun, given that the mass of the earth = 6X1024kg and of the sun = 2X1030kg? The average distance between them is 1.5X1011m.

Q 42 Two objects of masses m1 and m2 exert a force F on each other when they are separated by a distance,r. What happens when
(i) Mass m1 is doubled,
(ii) The distance between them is halved?

Q 43 Explain why iron nail sinks in water, but a ship made up of iron floats?

Q 44 Distinguish between g and G.

Q 45 A body of weight 600 N rests on the floor of a lift. If the lift begins to fall freely under the gravity, what is the force with which the body presses on the floor?

Q 46 How can you calculate the value of acceleration due to gravity?

Q 47 How one can calculate the value of acceleration due to gravity on the surface of the moon?
Q 48 If the planet existed whose mass and radius both were half those of the earth, then what will be the acceleration due to gravity at its surface?

Q 49 To estimate the height of a bridge over a river, a stone is dropped freely in the river from the bridge. The stone takes 2 seconds to touch the water surface in the river. Calculate the height of the bridge from the water level.(g = 9.8 m/s2).

Q 50 How much would a 70 kg man weigh on the moon? What would be his mass on the earth and on the moon? (Acceleration due to gravity on the moon = 1.63 m/s2)

Q 51 When a spherical ball is suspended with an iron string, the length of the string increases. However, the length of the string decreases when the ball is completely immersed in water. Why? Explain.

Q 52 How do a submarine sink and float on water?

Q 53 Calculate the density of iron if an iron cylinder of radius 14mm and length 80mm weighs 369.6g.

Q 54 In which case is the depression in the cushion more – when a person stands on it or when he lies down on it? Explain.

Q 55 Give reasons for the following.
1. A plastic block released under water never stays under water but comes to the surface of the water.
2. Sleepers are laid below the rails.

Marks (5)

Q 56 State and explain the Universal law of Gravitation.

Q 57 A ball is dropped from the top of a tower 100m high and at the same time another ball is projected vertically upwards from the ground with a velocity of 25m/sec. Calculate where and when the two stones will meet. Take g=10m/s2.

Q 58 How will you calculate relative density of a cork using Archimedes‘s Principle?

Q 59 (i) How do fishes float in water?
(ii) Write the conditions that takes place when a solid is immersed in a fluid.

Q 60 The force on a phonogram needle of cross-section of radius of 0.01cm, is 1.5N. Find the pressure it exerts on the record in
(i) Pa
(ii) atm

Q 61 What do you understand by relative density? What is the unit of relative density?
Manoj have a metal block of dimension 25cm x 10cm x 5cm. Now, if the mass of the block is 5kg, then calculate the greatest and least pressure exerted by the block?

Q 62 A piece of iron is totally immersed in water. If its density is 7.8 x 103 kg/m3 and volume is 10-4m3 then calculate
(i) The upthrust
(ii) Apparent weight of iron piece in water
 

Most Important Questions

Q 1 An object dropped from a height always fall towards earth. Why?

Q 2 Weight of an object on earth and moon is different. Why?

Q 3 In your daily life you experience force of gravitation. Give some examples,

Q 4 What is gravitation?

Q 5 State Newton‘s law of motion.

Q 6 What do you understand by centripetal force?

Q 7 What do you understand by gravitational force?

Q 8 What do you understand by free fall of an object?

Q 9 How does the force of gravitation between two objects change on reducing the distance to half?

Q 10 If we neglect the friction of air then all the objects fall with the same speed. Why does a heavy object do not fall faster?

Q 11 If the earth attracts moon, why doesn‘t it move towards earth?

Q 12 Every thing exert force on the other. It means that we also exert force on each other. Is this true? If yes, then why we does not feel this force?

Q 13 When my servant bring water in a pitcher, she place a thick piece of cloth on her head before placing pitcher. Why?

Q 14 Moon exert gravitational force on earth. Give one example.

Q 15 State universal law of gravitation.

Q 16 Find the gravitational force acting between earth and an object of 2 kg.

Q 17 What do you mean by free fall?

Q 18 Mass of an object is 20kg. What is its weight of
(i) Earth.
(ii) Moon.

Q 19 What do you understand by thrust?

Q 20 What do you understand by pressure?

Q 21 What is the acceleration for free fall?

Q 22 Acceleration due to gravity is same for all objects. But a book falls faster than a paper. Why?

Q 23 Ball thrown up vertically reaches to maximum height in 6 s. Find
(a) The velocity with which it was thrown up.
(b) The maximum height it reaches.
(c) Its position after 4 s.

Q 24 Rahul took a plastic ball. He pushed it deep in a tank full of water. As soon as he released the ball, the ball comes on the surface of water. Why?

Q 25 Tyres of truck are wider than that of a car. Why?

Q 26 I have a book having dimensions 40cmx30cmx4cm and mass 500g. Find the pressure exerted by it on the table.
(i) When book lies down on the table.
(ii) When book is kept on the table such that it covers 30cmx4cm area of the table.

Q 27 State equations of motion for free fall.

Q 28 A stone is released from the top of a building of height 19 m. Calculate its final velocity.

Q 29 Every thing exert force on the other. It means that we also exert force on each other. Is this true? If yes, then why we does not feel this force?

Q 30 When my servant brings water in a pitcher, she place a thick piece of cloth on her head before placing pitcher. Why?

Q 31 What happens to the force between two objects, if
(i) Mass of one object is tripled?
(ii) Distance between the objects is doubled?
(iii) Masses of both objects are doubled?

Q 32 What do you understand by buoyant force?

Q 33 Give two examples of buoyancy.

Q 34 Give the conditions for an object to float or sink.

Q 35 The volume of a substance of 50 g, is 20 cm-3. The density of water is 1 g-cm-3. Will the substance float or sink? What will be the weight of water displaced by the substance?

Q 36 State Archimedes‘ principle.

Q 37 Write some applications of Archimedes‘ principle.

Q 38 What is relative density?

Q 39 Why we measure the relative density of a substance?

Q 40 Relative density of silver is 11 and the density of water is 103 Kg-m-3. What is the density of silver in S.I. Units?

Q 41 How will you detect that the milk is pure or impure?

Q 42 How will you conclude that a particular sample of water is pure?

Q 43 How does a submarine sinks and float?

Q 44 Show that, if the weight of fluid displaced by the object is more than its weight then it will sink in the fluid.

Q 45 An iron piece weighs 600 g in air and 400 g in water. Find volume of the solid.

Q 46 How an air balloon rises up?

Free study material for Science

Chapter 9 Gravitation Printable Assignments & Solutions for Class 9 Science

Revision Assignment: Chapter 9 Gravitation (CBSE)

Access structured practice assignments for Chapter 9 Gravitation designed in alignment with the latest CBSE curriculum for Class 9 Science. These printable sets cover objective and descriptive problem types to support thorough revision.

Key Advantages of Solving Chapter 9 Gravitation Assignments

  • Syllabus Compliance: Sets reflect current CBSE evaluation criteria and official marking frameworks.
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  • Time Management: Routine practice optimizes pacing to finish school examinations comfortably within schedule.

Steps to Complete Chapter 9 Gravitation Assignments Successfully

  1. Concept Foundation: Review the NCERT book for Class 9 Science thoroughly before diving into assignment tasks.
  2. Self-Evaluation: Solve exercises independently before inspecting professional answer guides.
  3. Progress Monitoring: Note down complex formulas or concepts, clearing them up using available online practice aids.

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