## Class 9 Science Case Study Questions Chapter 10 Gravitation

Case study Questions in Class 9 Science Chapter 10 are very important to solve for your exam. Class 9 Science Chapter 10 Class 9 Science Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving case study-based questions for Class 9 Science Chapter 10 Gravitation

In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

# Gravitation Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 9 Science Chapter 10 Gravitation

Case Study/Passage-Based Questions

Case Study 1: According to the universal law of gravitation, the force between two particles or bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance between these particles or bodies. Consider two bodies A and B having masses m1 and m2 respectively. Let the distance between these bodies be R. The force of gravitation between these bodies is given by

F ∝ m1m2 and F ∝ 1/R2

F =G m1 m2/R2

Where G is constant and is known as the “universal gravitational constant”.

Newton’s law of gravitation is valid
(a) in laboratory
(b) only on the earth
(c) only in our solar system
(d) everywhere

Gravitational force is a
(a) repulsive force (b) attractive force
(c) neither (a) nor (b) (d) both (a) and (b)

Two particles of mass m1 and m2, approach each other due to their mutual gravitational attraction only. Then
(a) accelerations of both the particles are equal.
(b) acceleration of the particle of mass m1 is proportional to m1.
(c) acceleration of the particle of mass m1 is proportional to m2.
(d) acceleration of the particle of mass m1 is inversely proportional to m1.

Answer: (c) acceleration of the particle of mass m1 is proportional to m2.

The gravitational force between two bodies is 1 N. If the distance between them is made half, what will be the force?
(a) 2 N (b) 4 N (c) 6 N (d) 7 N

How does the force of gravitation between two objects change when the distance between them is reduced to half?
(a) Force of gravitation becomes 4 times
(b) Force of gravitation becomes 9 times
(c) Force of gravitation becomes 6 times
(d) Force of gravitation becomes 12 times

Answer: (a) Force of gravitation becomes 4 times

Case Study/Passage-Based Questions

Case Study 2: All freely falling bodies fall with a uniform acceleration due to gravity. As a result, all the equations of motion for the uniformly accelerated bodies moving in a straight line are applicable to the freely falling bodies.

The value of g is taken as positive when a body is
(a) dropped from a certain height
(b) moving in horizontal direction
(c) both (a) and (b)
(d) none of these

Answer: (c) both (a) and (b)

Velocity of an object at maximum height in case it has been thrown vertically upward is
(a) maximum (b) minimum
(c) zero (d) 9.8 m s–1

During free fall, the acceleration of the object is
(a) zero (b) non-uniform
(c) constant (d) none of these

Case Study 3: Gravitation is the force of attraction that exists between any two objects with mass. It is a fundamental force in nature that governs the motion of celestial bodies and plays a crucial role in our everyday lives. The force of gravity depends on the masses of the objects involved and the distance between them. According to the law of gravitation formulated by Sir Isaac Newton, the force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. This law explains the motion of planets, the falling of objects on Earth, and many other phenomena. The value of acceleration due to gravity is approximately 9.8 m/s^2 on the surface of the Earth. Understanding the concept of gravitation is essential for comprehending various phenomena in the universe and for solving problems related to motion and forces.

What is gravitation?
a) The force of attraction between any two objects with mass
b) The force of repulsion between any two objects with mass
c) The force of attraction between a planet and its moon
d) The force of attraction between the Earth and the Sun
Answer: a) The force of attraction between any two objects with mass

What factors determine the force of gravity between two objects?
a) Masses of the objects and the distance between them
b) Speeds of the objects and the direction of their motion
c) Shapes of the objects and their surface areas
d) Colors of the objects and their temperature
Answer: a) Masses of the objects and the distance between them

According to the law of gravitation, how is the force of attraction between two objects related to their masses and distance?
a) Directly proportional to the masses and inversely proportional to the distance
b) Directly proportional to the distance and inversely proportional to the masses
c) Inversely proportional to both the masses and the distance
d) Directly proportional to both the masses and the distance
Answer: a) Directly proportional to the masses and inversely proportional to the distance

What does the law of gravitation formulated by Sir Isaac Newton explain?
a) The motion of planets
b) The falling of objects on Earth
c) Both a) and b)
d) None of the above
Answer: c) Both a) and b)

What is the approximate value of acceleration due to gravity on the surface of the Earth?
a) 9.8 cm/s^2
b) 9.8 m/s
c) 9.8 km/h
d) 9.8 m/s^2