Now come to KIPS notes for 9th Class of Chapter 5, Gravitational. It’s one of my favorite chapters which is all about gravitation, the law of gravitation, orbital velocity and much more.
Do you know?
Someone who weighs 150 pounds on Earth would — if it were possible to stand on Jupiter — weigh a whopping 354 pounds on the enormous gas giant. Larger masses have greater gravity.
All the chapters of 9th Class Physics have been uploaded here on Top Study World if you want to download the KIPS notes with ease in one place.
Previously: Chapter 4: Turning Effect of Force (9th Class KIPS Notes)
Do you belong to Federal Board, Lahore Board, Faisalabad Board, Rawalpindi Board, Sargodha Board, Wah Board? Then these notes are helpful.
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Chapter: 5th Chapter of 9th Class Physics
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KIPS MCQs OF CH# 5 FOR 9TH CLASS PHYSICS
1. ______ predicted about artificial satellites about 300 years ago.
In the year 1687, Sir Isaac Newton published his famous book Philosophiae Naturalis Principia Mathematica, laying the foundation for classical mechanics. At the end of the book, there is a section called “Scholium” where Newton discusses several concepts not fully explained in the main text. One topic that is particularly interesting is how he describes what would happen if a cannonball were fired fast enough from the top of a mountain high enough:
If a cannonball were fired from a mountain top with sufficient velocity, it would never fall to earth due to theearth’s rotation.
In other words, Newton predicted about artificial satellites about 300 years ago. Why don’t we celebrate this?
Newton’s statement is not entirely correct. The concept of an orbit was not fully understood at his time and he did not consider that an object can also stay in orbit if it is not fired with sufficient velocity. But his statement was very close to reality and it makes you wonder why don’t we celebrate this prediction more often?
Newton had brilliant insights when it came to physics. He could use mathematics and geometry to describe concepts that are extremely hard to explain in words.
2. Unit of gravitational field strength is:
3. The distance of the moon from Earth is?
4. The speed of GPS satellite is:
5. If the distance between two masses is half then the force of gravitation becomes:
6. In System International, the value of G is
7. The radius of the earth is:
8. The SI unit of gravitational force is:
9. What will be the value of G if the mass of the earth becomes four times:
10. The mass of Earth is approximate:
11. As we go up the value of G becomes:
12. The force which pulls the object towards the center of the circle is known as ___ force:
13. When an object is at a height equal to the radius of earth above the surface of the earth. What is the value of gh?
14. What is not true about g?
15. If the weight of an object on the surface of the earth is W. Its weight on the surface of the moon will be:
16. On mountains, our weight will be——— as compared to weight on the surface of
17. If the mass of both the bodies is 1kg and distance between their centers are 1m then the gravitational force will be equal to:
18. A satellite is revolving around the earth in a circular orbit. If the radius of the orbit is increased from R to 2R. What will be its velocity?
19. An artificial satellite keeps on revolving around the earth in different orbits with uniform speed due to the?
20. Relative velocity ·of Geostationary satellite with respect to earth is:
21. If a rocket is fired vertically with a speed of———-, it will start revolving .around the earth:
22. The height of the Geostationary satellite above the surface of the earth is:
23. The gravitational force on the surface of the earth is equal to:
24. The weight of the body of mass 10 kg on the surface of the moon:
The MCQs with Answers In the Below Images
KIPS SHORT QUESTIONS OF CH# 5
1. Define gravitation.
2. State law of gravitation
3. What is the relation between Law of Gravitation and Newton’s Third law of motion?
4. What is Gravitational Field Strength?
5. Define-orbital velocity
6. What do you know about Global Positioning System (GPS)?
7. What will happen if Earth suddenly stops revolving around the Sun?
8. What do you know about geostationary satellites?
9. What is the effect of the followings on the gravitational acceleration?
i) Mass of freely falling body.
ii) Distance of freely falling body from the center of birth
10. Is there any difference between the value of ‘g’ at tile equator and at the poles?
11 The moon revolves around the earth, from where it gets necessary centripetal force?
12. If we go on top of the mountain, will our weight increase or decrease?
13.Why do not we observe force of attraction between any two objects around us?
14. What is the gravitational force acting on the body placed on the surface of Earth?
The Questions With Answers in the Below Images
KIPS LONG QUESTIONS OF CH# 5
1. State and explain Newton’s law of gravitation.
2. Explain the gravitational field?
3. Determine the mass of the earth by using Newton’s law of gravitation.
4. Explain the variation of ‘g’ with altitude.
5. What are artificial satellites? Define orbital velocities and what do you know about communication satellites?
6. Explain the motion of an artificial satellite and derive the formula for the orbital velocity of an artificial satellite?
The Long Questions With Answers in the Below Images
KIPS TEXTBOOK EXCERCISE OF CH# 5 FOR 9TH CLASS PHYSICS
MCQs of Textbook
1. Earth’s gravitational force of attraction vanishes at:
2. The value of g increases with the:
3. The value of g at a height one Earth’s radius above the surface of Earth is:
4. The value of g on moon’s suface is 1.6 ms-2• What will be the weight of a 100 kg body on the surface of the moon?
5. The altitude of geostationary orbits in which communications satellites are launched above the surface of Earth is:
6. The orbital speed of a low-orbit satellite is:
1. What is meant by force of gravitation?
2. Do you attract the earth or the Earth attracts you? Which one is attracting with a larger force? You or Earth?
3. What is a field force?
4. Why earlier scientists could not guess about the gravitational force?
5. How can you say that gravitational fovce.is a field force?
6. Explain what is meant by gravitational field strength?
7. Why law of gravitation is important to us?
8. Explain the law of gravitation?
9. How the mass of’Earth can be determined?
10. Can you determine the mass of our·moon? If yes, then what you need to know?
11. Why does the value of g vary from place to place?
12. Explain how the value of g varies with altitude.
13. What are artificial satellites?
14. How Newton’s law of gravitation helps in understanding the motion of satellites.
15. On what factors the orbital speed of a satellite depends?
16. Why communication satellites are stationed at geotationary orbits?
The MCQs and Short Questions of Textbook With Answers in the Below Images
KIPS SOLVED NUMERICALS OF CH# 5 FOR 9TH CLASS PHYSICS
1. Find the gravitational force of attraction between two spheres each of mass 1000 kg.
The distance between the centers of the spheres is 0.5m.
2. The gravitational force between two identical lead spheres kept at 1 m apart is
0.006673 N. Find their masses.
3. Find the acceleration due to gravity on the surface of the Mars. The mass of Mars is 6.42 x 1023 kg and its radius is 3370 km.
4. The acceleration due to gravity on the surface of moon is 1.62 ms-2• ·The radius of
Moon is 1740 km. Find the mass of moon.
5. Calculate the value of g at a height of 3600 km above the surface of the Earth.
6. Find the value of g .due to the Earth at geostationary satemte. The radius of the
geostationary orbit is 48700 km.
7. The value of g is 4.0 ms-2 at a distance of 10000 km from the centre of the .Earth.
Find the mass of the Earth.
8. At what altitu.de the value of g would become one fourth than on the surface of the
9. A polar satellite is launched at 850 km above Earth. Find its orbital speed.
The Numerical With Solutions In the Below Images
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