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## gravitation class 9 questions

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So, acceleration = $$\frac{\text { Force }}{\text { Mass }}=\frac{20}{1}$$ = 20 m/s2, Question 3. Answer: Question 1. MCQ on gravitation.> In this post I come up with some important general knowledge questions with answers on a very crucial topic called Gravitation.These multiple choice questions are very important for upcoming exams for general science like SSC, CGL, CHSL, MTS, Railway Group-D, Group-C, IAS, UPSC Air force and Navy. Let the mass, m3 = 0.5 kg be placed at a distance of ‘x’ m from m1, as shown in figure. (Where Ve is the volume of the earth) A stone is dropped from the top of a 40 m high tower. Answer: One second later, he throws another stone. The force of gravity decreases with altitude. Question 8. [NCERT Exemplar] Question 3. Mass of the moon = 7.4 x 10^22 kg ... physics questions and answers for class 9 cbse icse; By Anupam M. Post navigation. Gravitational force between moon and the earth keeps moon in uniform circular motion around the earth. The earth attracts the moon with a force that is: (a) More than that exerted … i.e., First stone would take 3.16 s to reach the ground. Why does a body orbiting in space possess zero weight with respect to a spaceship? (G = 6.67 × 1011 Nm2kg-2) Is the acceleration due to gravity acting on a freely falling body directly proportional to the (a) mass of the body? The gravitational force is responsible for providing the necessary centripetal force which allows the earth to move around the sun at the defined path or orbit. The value of ‘g’ at the equator of the earth is lesser than that at poles. Why can one jump higher on the surface of the moon than on the earth? Time taken to reach the ground, t = 4 s Gravitation CBSE Class 9 Science Chapter 11 - Complete explanation and Notes of the chapter 'Gravitation'.. This object was carried to the moon. Question 1: A body weights 700 g wt. Find the percentage change in the weight of a body when it is taken from the equator to the poles. On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Get NCERT Solutions, Notes, Solutions to Intext Questions, Examples of Chapter 10 Class 9 Gravitation free at Teachoo.In this chapter, we will learnWhat isGravity?What isUniversal Law of GravitationImportantNatural PhenomenaOccurring Due to GravitationWhat isFree Fall?What isAcceleration Due To Grav It occurs only when a body is in a state of free fall under the effect of gravity alone. Question 6. Question 12. The moon will begin to move in a straight line in the direction in which it was moving at that instant because the circular motion of moon is due to centripetal force provided by the gravitational force of the earth. (c) 10 kg. Height of the building, h = ? Mass of the earth, Me = 6 × 1024 kg For the first stone (g) At point C, RD Sharma Class 11 Solutions Free PDF Download, NCERT Solutions for Class 12 Computer Science (Python), NCERT Solutions for Class 12 Computer Science (C++), NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Micro Economics, NCERT Solutions for Class 12 Macro Economics, NCERT Solutions for Class 12 Entrepreneurship, NCERT Solutions for Class 12 Political Science, NCERT Solutions for Class 11 Computer Science (Python), NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Entrepreneurship, NCERT Solutions for Class 11 Political Science, NCERT Solutions for Class 11 Indian Economic Development, NCERT Solutions for Class 10 Social Science, NCERT Solutions For Class 10 Hindi Sanchayan, NCERT Solutions For Class 10 Hindi Sparsh, NCERT Solutions For Class 10 Hindi Kshitiz, NCERT Solutions For Class 10 Hindi Kritika, NCERT Solutions for Class 10 Foundation of Information Technology, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 9 Foundation of IT, PS Verma and VK Agarwal Biology Class 9 Solutions, NCERT Solutions for Class 10 Science Chapter 1, NCERT Solutions for Class 10 Science Chapter 2, Periodic Classification of Elements Class 10, NCERT Solutions for Class 10 Science Chapter 7, NCERT Solutions for Class 10 Science Chapter 8, NCERT Solutions for Class 10 Science Chapter 9, NCERT Solutions for Class 10 Science Chapter 10, NCERT Solutions for Class 10 Science Chapter 11, NCERT Solutions for Class 10 Science Chapter 12, NCERT Solutions for Class 10 Science Chapter 13, NCERT Solutions for Class 10 Science Chapter 14, NCERT Solutions for Class 10 Science Chapter 15, NCERT Solutions for Class 10 Science Chapter 16, CBSE Previous Year Question Papers Class 12, CBSE Previous Year Question Papers Class 10. Question 5. Given m1 = 3 kg; m2 = 12 kg We know that G = 6.67 × 10-11 Nm2 kg-2 Answer: ⇒ m1 = m2, Question 3. Solve high order thinking questions related to gravitation and prepare for your exam in a better and easy way. Both stones will take the same time to reach the ground because the two stones fall from the same height. Question 3. Question 2. 2 F (½) F . F = $$G \frac{m M}{R^{2}}$$ …..(1) i.e., weight will increase by 10%. ⇒ Time of ascent = Time of descent. NCERT Exemplar Problems Class 9 Science – Gravitation. When a body is dropped from a height, what is its initial velocity? Answer: How does the weight of an object vary with respect to mass and radius of the earth? Question 3. (b) No. Answer. Answer: To design hydrometers to find the density of liquids. (a) No The earth and the moon are attracted to each other by gravitational force. Why are broad handles provided in bags and suitcases? Raman is a curious student and his teacher is a cooperative person. The acceleration due to gravity does not depend upon the mass of the stone or body. Answer: What is the centripetal force that makes moon revolve around earth? This hypothesis is not correct. Lactometer works on Archimede’s principle. We know that g = $$\frac{G M}{R^{2}}$$ or M = $$\frac{g R^{2}}{G}$$ 0 = u – gt1 Answer: Answer: or, v = $$\sqrt{800}$$ What will be its speed when it has fallen 100 m? The weight of the body on the moon is about one-sixth of its weight on the earth. Answer: Given, Mass of the Sun, M = 2 x 10 30 kg Question 4. Answer: Answer: Initial velocity, u = 0 (f) Acceleration = 10 ms-2 In case of free fall acceleration does not depend upon mass and size. Answer: = M + $$\frac{10}{100}$$M = M + $$\frac{M}{10}$$ = $$\frac{11M}{10}$$ = 1.1 M Weight of the same body on the earth’s surface will be Question 1. 1. Wm = $$\frac{G M_{m} m}{R_{m}^{2}}$$ …(1) Question 1. (i) We know v2 – u2 Question 7. [NCERT Exemplar] If the radius of the earth becomes twice of its original radius, then Initial speed, u = 0.5 m/s Answer: Answer: Answer: Yes, fluids have weight. NCERT Solutions Class 9 Science Chapter 10 Gravitation – Here are all the NCERT solutions for Class 9 Science Chapter 10. If the mass of a body is 9.8 kg on the earth, what would be its mass on the moon? Suppose the mass of the earth somehow increases by 10% without any change in its size. Suppose the radius of the earth becomes twice of its present radius without any change in its mass, what will happen to your weight? Gravitation | NCERT Exercises, Questions 10, 11 & 12 | CBSE Class 9 Physics | Science Chapter 10 | Vedantu Class 9 and 10. Thus a big stone will fall with the same acceleration as a small stone. [NCERT Exemplar] Is the time taken by a body to rise to the highest point equal to the time taken to fall from the same height? This portal is designed to support Students and Teachers of Central Board of Secondary Education. The tides in the sea formed by the rising and falling of water level in the sea are due to the gravitational force of attraction which the sun and the moon exert on the water surface in the sea. (ii) Weight = $$\frac{G M m}{r^{2}}$$, where r is the radius of the earth. Answer. % Variation in the weight of a body = % Change in g = 0.7%. But we know, acceleration ∝ 1/m. When r changes to 2r, the new weight is given by Acceleration, g = – 9.8 m/s2 or F = G × $$\frac{m_{1} m_{2}}{r^{2}}$$ ……..(3) Weight, W = mg, m = $$\frac{W}{g}$$, m = $$\frac{9.8}{9.8}$$ = 1 kg ⇒ t2 = $$\frac{98}{9.8}$$ = 10 [NCERT Exemplar] Downward motion ∴ v = u Log in, Concise Mathematics Class 10 ICSE Solutions 2018. Answer: (3) h2 = $$\frac{1}{2} g t_{2}^{2}$$, Physics-Gravitation & Pressure: Questions 1-5 of 43. = $$\frac{G M m}{4 r^{2}}=\frac{W}{4}$$ v = u + gt1 Acceleration due to gravity is the acceleration acquired by a body due to the earth’s gravitational pull on it. It also varies on the surface of the Earth, decreasing from poles to the equator. [NCERT Exemplar] Register online for Science tuition on Vedantu.com to score more marks in your examination. Why does a body reach the ground quicker at poles than at the equator when dropped from the same height? According to Newton’s third law of motion, action and reaction are equal and opposite. As we know s = ut + $$\frac{1}{2}$$ gt2 The atmosphere of the Earth is possible due to the gravitational force. Answer: Here, s = 100 m, u = 0 If the average distance between the Sun and the Earth is 1.5 x 10 11 m, calculate the force exerted by the Sun on the Earth and also by Earth on the Sun. The skilled and well- experienced subject teachers who hold huge experience has prepared these Class 9 Science Solutions. At the poles. Answer. Question from very important topics are covered by NCERT Exemplar Class 9.You also get idea about the type of questions and method to answer in your Class 9th examination. As the body falls back to the earth with the same velocity it was thrown vertically upwards. The gravitational force in the downward direction. Therefore, the body appears to be floating weightlessly. Thus, the gravitational constant G is numerically equal to the force of gravitation which exists between two bodies of unit masses kept at a unit distance from each other. Why does formation of tides takes place in sea or ocean? That is, for the second stone, t = (3.16 – 1)s = 2.16s As per the law: Everybody in the universe attracts every other body with a force, which is directly proportional to the product of their masses and inversely proportional to the square of distance between them. ∴ New weight becomes 4 times. The weight will become 16 times. (a) In which direction is the ball moving at point C? ∴ W = $$\frac{G M m}{r^{2}}$$ How is gravitation different from gravity? Question 15. (ii) How long will it take to reach that height? NCERT Solutions for Class 9 Science Chapter 10 - Gravitation [FREE]. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Gravitation. If the mass of one body is doubled, force is also doubled. ∴ 49 = 0 × t + $$\frac{1}{2}$$ × 9.8 × t2 [NCERT Exemplar] (i) Original weight = $$\frac{G M m}{r^{2}}$$, where M is the mass of the earth. Comment. (a) Downward Question 10. 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