NCERT Solutions for class 9 Science chapter 10 Gravitation is prepared and uploaded for reference by academic team of expert members of Physics Wallah. Get solutions of all chapters of NCERT class 9 Science from Physics Wallah. use as a reference of the following NCERT solutions of chapter 10 Gravitation prepared by Physics Wallah. Read the theory of chapter while before going to exam.
Question 2. Write the formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth.
Solution : The formula to find the magnitude of the gravitational force between the earth and an object on the surface of the earth is given below:
Gravitation Class 11 Ncert Solutions Pdf Download
Download File 🔥 https://shoxet.com/2yGBdj 🔥
Question 6. Why is the weight of an object on the moon 1/6 th its weight on the earth?
Solution : Mass of object remains the same whether on earth or moon but the value of acceleration on moon is 1/6th of the value of acceleration on earth. Because of this weight of an object on moon is 1/6th its weight on the earth.
Question 7. Why is it difficult to hold a school bag having a strap made of a thin and strong string?
Solution : It is difficult to hold a school bag having a strap made of a thin and strong string because a bag of that kind will make its weight fall over a small area of the shoulder and produce a greater pressure that makes holding the bag difficult and painful.
Question 9. Why does an object float or sink when placed on the surface of water?
Solution : As an object comes in contact with the surface of a fluid it experiences two types of forces: gravitational force or gravity that pulls the object in downward direction and the second force is the force of buoyancy that pushes the object in upward direction.
It is these two forces that are responsible for an object to float or sink
i.e. if gravity >buoyancy then object sinks
if gravity
Question 10. How does the force of gravitation between two objects change when the distance between them is reduced to half?
Solution : The force of gravitation between two objects is inversely proportional to the square of the distance between them therefore the gravity will become four times if distance between them is reduced to half.
Question 11. Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?
Solution : In free fall of objects the acceleration in velocity due to gravity is independent of mass of those objects hence a heavy object does not fall faster than a light object.
Question 12. 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 x 1024 kg and radius of the earth is 6.4 x 106 m.)
Solution :
Question 13. 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?
Solution : 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 14. If the moon attracts the earth, why does the earth not move towards the moon?
Solution : Earth does not move towards moon because mass of moon is very small as compared to that of earth.
Question 15. 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?
Solution :
Question 19. 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.]
Solution :
Since W = m x g and given in the Question that value of g is greater at the poles than at the equator, hence weight of same amount of gold will be lesser at equator than it was on the poles. Therefore, the friend will not agree with the weight of gold bought.
Question 20. Why will a sheet of paper fall slower than one that is crumpled into a ball?
Solution : A greater surface area offers greater resistance and buoyancy same is true in the case of a sheet of paper that has larger surface area as compared to paper crumpled into a ball. So sheet of paper falls slower.12. Gravitational force on the surface of the moon is only 1/6 as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the earth?
Question 21. Gravitational force on the surface of the moon is only 1/6 as strong as gravitational force on the earth. What is the weight in newtons of a 10 kg object on the moon and on the earth?
Solution :
Question 26. 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.
Solution :
Suppose both the stones will meet after t seconds.
Question 29. Why does a block of plastic released under water come up to the surface of water?
Solution : Since of plastic has density very less as compared to water i.e. weight of plastic is less than the buoyant force experienced by it therefore a block of plastic released under water come up to the surface of water/floats.
NCERT Solutions for Class 9 Science Gravitation part 2 Class 9 Science book solutions are available in PDF format for free download. These ncert book chapter wise questions and answers are very helpful for CBSE exam. CBSE recommends NCERT books and most of the questions in CBSE exam are asked from NCERT text books. Class 9 Science chapter wise NCERT solution for Science Book for all the chapters can be downloaded from our website and myCBSEguide mobile app for free.
NCERT Solutions Class 9 Science PDF (Download) Free from myCBSEguide app and myCBSEguide website. Ncert solution class 9 Science includes text book solutions .NCERT Solutions for CBSE Class 9 Science have total 15 chapters. 9 Science NCERT Solutions in PDF for free Download on our website. Ncert Science class 9 solutions PDF and Science ncert class 9 PDF solutions with latest modifications and as per the latest CBSE syllabus are only available in myCBSEguide.
To download NCERT Solutions for class 9 Science, Computer Science, Home Science,Hindi ,English, Maths Social Science do check myCBSEguide app or website. myCBSEguide provides sample papers with solution, test papers for chapter-wise practice, NCERT solutions, NCERT Exemplar solutions, quick revision notes for ready reference, CBSE guess papers and CBSE important question papers. Sample Paper all are made available through the best app for CBSE students and myCBSEguide website.
Physics is often one of the most dreaded subjects by students. However, if approached correctly it can soon turn to be of the easiest and most enjoyable subject. Not only can you score well in Physics but it can awaken a lifelong love for the sciences. So it is very important that the student take the correct approach while studying a conceptual subject like physics. Here we have the NCERT Solutions for Class 11 Physics to help you with this process.
Every single function of our life is actually governed by some law or concept of physics. It is said that physics can actually explain everything from the beginning of the universe to life in the present. In class 11 students are introduced with some basic concepts and laws of physics. We will be covering important chapters such as units of measurements, motion in a plane and straight line, gravitational force, kinetic energy, etc.
Here students are introduced to the international system of units and its history. They will learn about concepts such as base units and derived units. There are also numerical problems regarding volume and surface area of objects.
This is the introduction of Kinetics. We will learn about rectilinear motion, reference points, path lengths, relative velocity, acceleration, and other such interesting concepts. There are also some basic mathematical problems for the students to practice.
Students will learn about the differences between scalar and vector quantities. The chapter covers topics such as equality, addition, and multiplication of vectors, angular frequency and velocity, displacement and more.
This chapter further explains the motion of an object and the effect external forces can have on it. We will learn about the direction and magnitude of the force and the effects of gravitation. There are numerical problems and graphical representation to calculate the time and speed of moving objects.
In this chapter, we learn the theoretical concept of rotational motion and also the mathematical method of its calculation. The NCERT solutions will make the concepts clear and deepen the students understanding of the chapter.
Here students will learn about certain common physical properties of solids such as density, elasticity, tensile strength, volume strain, etc. We will see the real-life applications of certain solids such as steel and copper.
In this chapter, we will learn the concept and definitions of heat and temperature. We will learn how different matter behaves differently when the heat is applied to it. There are some mathematical problems about the conversion of celsius and kelvin.
Students will study in detail about oscillations and oscillatory motion. They will need to learn about periodic motion and harmonic motion and problems regarding them as well as their graphical representation. 152ee80cbc
rnc jaipur registration certificate download pdf
the secret ebook kindle free download