# CBSE Class 9 Physics Gravitation Worksheet Set B

Read and download free pdf of CBSE Class 9 Physics Gravitation Worksheet Set B. Students and teachers of Class 9 Physics can get free printable Worksheets for Class 9 Physics in PDF format prepared as per the latest syllabus and examination pattern in your schools. Standard 9 students should practice questions and answers given here for Physics in Grade 9 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 9 Physics Worksheets prepared by school teachers as per the latest NCERT, CBSE, KVS books and syllabus issued this academic year and solve important problems provided here with solutions on daily basis to get more score in school exams and tests

## Gravitation Class 9 Physics Worksheet Pdf

Class 9 Physics students should refer to the following printable worksheet in Pdf for Gravitation in standard 9. This test paper with questions and answers for Grade 9 Physics will be very useful for exams and help you to score good marks

### Class 9 Physics Worksheet for Gravitation

CBSE Class 9 Physics Worksheet - Gravitation - Practice worksheets for CBSE students. Prepared by teachers of the best CBSE schools in India.

GRAVITATION

1. Define : gravitation, gravity and gravitational force.

2. State the universal law of gravitation and its mathematical form.

3. In what source is ‘G’ universal?

4. What happens to the force of attraction between two objects when

(i) Their mass are halved?

(ii) Distance between them is increased to 4 times its previous value.

(iii) Distance between them as well as each of the mass is increase to 4 times.

5. If the distance between two bodies is increased 4 times by what factor should the mass of the bodies be altered so that the gravitational force between them remains the same?

6. What is the force between two spheres weighing 20 kg each and placed 50 cm apart?

7. A sphere of mass 40 kg is attracted by another sphere of mass 15 kg when their centres are 0.2m apart with force of 9.8 x 10-7 N. Calculate value of ‘G’.

8. Find the distance between two stones each of mass 2 kg so that the gravitational force between them is 1N.

9. Gravitational force between two objects on earth is 2N. What will be the gravitational force between these two objects on the surface of the earth?

10. Why don’t we see objects in the universe colliding or moving towards each other due to gravitational force?

11. Why do all objects fall towards the earth?

12. Give a few examples / applications of the universal law of gravitation.

13. On what factor [s} does the gravity of a planet depend?

14. Define ‘G’ and give its value.

15. Differentiate between ‘g’ and ‘G’.

16. Define ‘g’ and give its value on the surface of the earth.

17. Name the factors on which ‘g’ depends.

18. Calculate the gravitational force between a body of mass 100 kg and the earth. Also calculate the acceleration produced in the body and that in earth.

19. A body weighs 1 kg on the surface of the moon. If mass of the moon is 7.4 x 10 22 kg and radius of moon is 1740 km. Calculate:

a. The force acting between the body & the moon.

b. Acceleration produced in the body

c. Acceleration produced in moon.

20. A planet has mass and radius 1/3 of those of earth. Calculate the acceleration due to gravity of the planet and compare it with acceleration due to gravity on earth. If an object has 5 kg mass on earth. Calculate its weight on the planet.

21. Differentiate between mass & weight of a body.

22. A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate:

i. the max height to which it rises. (ii) total time it takes to return to surface of the earth.

23. A stone is released from the top of a tower of height 19.6 m. Calculate the final velocity of a body just before touching the ground.

24. A stone is thrown vertically upwards with an initial velocity of 40m/s. Find the max height reached by the stone. What is the net displacement and the total distance covered by the stone? [g = 10m/s2]

25. The object dropped from a height (h) with initial velocity zero strikes the ground with a velocity of 30m/s. How long does it take to reach the ground. Also find h [g = 10m/s2]

26. The mass of a man is 75 kg. What will be his weight on surface of earth? What will be his weight on surface of moon?

27. A ball is projected vertically upwards with a certain velocity. What is its acceleration?

Exam Questions NCERT Class 9 Science Chapter 10 Gravitation

Question. . Name the scientist in whose honor the SI unit of pressure is named.
Ans : The SI unit of pressure is named after Blaise Pascal.

Question. . Name the force which accelerates a body in free fall.
Ans : Gravitational force of Earth.

Question. . What is the unit of “g”?
Ans : The unit of “g” is ms–2.

Question. . Why value of “g” more or less constant on or near the Earth?
Ans : Radius of Earth does not change much; “g” is more or less constant on or near the Earth.

Question. . What is weightlessness?
Ans : A body is said to be in a state of weightlessness when the reaction of the supporting surface is zero or its apparent weight is zero.

Students must free download and practice these worksheets to gain more marks in exams. CBSE Class 9 Physics Worksheet - Gravitation