If the earth attracts two objects with equal force, can we say that their masses must be equal? Browse from thousands of Gravitation questions and answers (Q&A). It is applied to all the body present in universe It is constant of proportionality in Newton’s universal law of gravitation. Answer: The value of ‘g’ at the equator of the earth is lesser than that at poles. Solution: The universal law of gravitation states that every object in the universe attracts every other object with a force called the gravitational force. Question 21. The mass of the Sun is 2 x 10 30 kg and that of the Earth is 6 x 10 24 kg. Question 2. Question 18. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. For both the stones ∴ v = u ⇒ m1 = m2, Question 3. Combining (1) and (2), we get W = \(\frac{G M m}{(2 r)^{2}}\) ⇒ t = \(\sqrt{10}\) = 3.16 s Question 10. Assume that g = 10 m/s2 and that there is no air resistance. ∴ v = 0 + (-10) × 2 = -20 ms-1 Justify your answer. (i) As v = u + gt Question 5. Answer According to question, M S = Mass of the Sun = 2×10 30 kg M E = Mass of the Earth = 6×10 24 kg R = Average distance between the Earth and the Sun = 1.5×10 11 m From Universal law of gravitation, 1. or h = \(\frac{0.25}{19.6}\) = 0.0127 m Question 7: Law of gravitation gives the gravitational force between (a) the earth and a point mass only At the equator. Answer: Question 3. Register online for Science tuition on Vedantu.com to score more marks in your examination. Q.18 What is the weight of a body of mass 1 kg? Question 1. u = 0 ms-1, h = 49 m, i.e., weight will increase by 10%. Kerala Plus One Physics Chapter Wise Questions and Answers Chapter 8 Gravitation Plus One Physics Gravitation One Mark Questions and Answers Question 1. Why does a body orbiting in space possess zero weight with respect to a spaceship? 1. Question 3. Answer: v = \(\sqrt{1960}\)m/s = 44.2 m/s. Which stone would reach the ground first and why? The position of required point is at a distance of 4 m from mass of 3 kg. mass of the moon, Mm = 7.4 × 1022 kg Question 15. Free PDF download of Important Questions with solutions for CBSE Class 9 Science Chapter 10 - Gravitation prepared by expert Science teachers from latest edition of CBSE(NCERT) books. Q1. (f) Acceleration = 10 ms-2 F ∝ m,1m2 and F ∝ \(\frac{1}{r^{2}}\) Both C and D; [(Kg-m/Sec 2) = N] Q.19 Weight of free fall object is. It means that the force on the apple due to earth’s attraction is equal to that on the earth due to apple’s attraction. Answer: As per the universal law of gravitation, the force of attraction between the earth and the body P is given by, What would happen to your weight? Two objects of masses ml and m2 having the same size are dropped simultaneously from heights h1 and h2, respectively. Question 1. Answer: What will be its speed when it has fallen 100 m? [NCERT Exemplar] Here are some practice questions that you can try. Fp = \(\frac{G \times M_{e} \times m_{1}}{R^{2}}\) …..(1) Given m1 = 3 kg; m2 = 12 kg Find out the speed with which he threw the second stone. A stone dropped from the roof of a building takes 4s to reach the ground. Free Question Bank for 11th Class Physics Gravitation Gravitation Conceptual Problems (ii) As v = u2 + 2 gs ans F ∝ \(\frac{1}{r^{2}}\) ..(2) Answer: Initial speed, u = 0.5 m/s (b) At point B Two planets of radii R 1 and R 2 have the same density. Answer: Original weight, W0 = mg = mG \(\frac{M}{R^{2}}\) Is the acceleration due to gravity acting on a freely falling body directly proportional to the (a) mass of the body? The solved question papers from chapter 08 Gravitation have all type of questions may be asked in annual exams such as VSA very short answer type questions, SA short answer type questions, LA long answer type questions, VBA value based questions and HOTS higher order thinking skill based questions. Question 9. What keeps the moon in uniform circular motion around the earth? Do fluids possess weight? (c) At point B Give reasons. 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. Thus a big stone will fall with the same acceleration as a small stone. % Variation in the weight of a body = % Change in g = 0.7%. As we know s = ut + \(\frac{1}{2}\) gt2 Suppose the mass of the earth somehow increases by 10% without any change in its size. Answer: Now, mass of the earth, Me = 6 × 1024 kg = \(20 \sqrt{2}\)ms-1, Question 6. How does the force of attraction between the two bodies depend upon their masses and distance between them? 3. Answer: Answer: (a) No Question 11. ∴ 49 = 0 × t + \(\frac{1}{2}\) × 9.8 × t2 where Me = mass of earth and Re = radius of earth. When M changes to new mass M’ What is the source of centripetal force that a planet requires to revolve around the sun? \(\frac{W_{m}}{W_{e}}=\frac{M_{m}}{M_{e}} \times \frac{R_{e}^{2}}{R_{m}^{2}}\) …. It is denoted by ‘g’. Explain why all of them do not fall into the earth just like an apple falling from a tree. 6.7 × 10-11 Nm2 kg-2) everywhere in the universe. Because the value of acceleration due to gravity (g) on the moon’s surface is nearly l/6th to that of the surface of the earth. Answer: Answer The universal law of gravitation states that every object in the universe attracts every other object with a force called the gravitational force.The force acting between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. Give one example each of central force and non-central force. (ii) Weight = \(\frac{G M m}{r^{2}}\), where r is the radius of the earth. or t = \(\frac{0.5}{9.8}\) = 0.05 s. Question 11. ⇒ Average density of the earth, D = \(\frac{\text { Mass }}{\text { Volume }}=\frac{g R^{2}}{G \times V e}\) the time taken by the second stone to reach the ground is one second less than that taken by the first stone as both the stones reach the ground at the same time. If the radius of the earth becomes twice of its original radius, then Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Question 1. or, v = \(\sqrt{800}\) Question 4. It is different at different places. Will this ratio remain the same if (i) one of the objects is hollow and the other one is solid; and (ii) both of them are hollow, size remaining the same in each case? Acceleration in downward direction = g Suppose the mass of the moon is Mm and its radius is Rm. The time taken for a body is less if the acceleration due to gravity is more when the initial velocities and the distance travelled are the same. So, acceleration = \(\frac{\text { Force }}{\text { Mass }}=\frac{20}{1}\) = 20 m/s2, Question 3. Yes. Mass is the quantity of matter contained in the body. Since, the two forces, i.e., Fp and FQ are equal, thus from (1) and (2), (G = 6.67 × 1011 Nm2kg-2) Gravitation Class 9 Extra Questions Numericals. Take the Quiz and improve your overall Physics. Yes, fluids have weight. Gravitation Multiple Choice Questions & Answers for competitive exams. h2 = \(\frac{1}{2} g t_{2}^{2}\), Comment. OTP has been sent to your mobile number and is valid for one hour Balbharati solutions for Science and Technology Part 1 10th Standard SSC Maharashtra State Board chapter 1 (Gravitation) include all questions with solution and detail explanation. Gravitation is the force of attraction that tends to draw together any two objects in the universe. Weight is not a constant quantity. mg = \(G \frac{m M}{R^{2}}\) or g = \(\frac{G M}{R^{2}}\) …(3) Question 19. A: Yes B: No. Question 5. Answer: Answer: part1, Page 1 Find the percentage change in the weight of a body when it is taken from the equator to the poles. Gravitation Class 9 Extra Questions Short Answer Questions-I. Question 17. For the second stone, Question 1. The acceleration due to gravity is more at the poles than at the equator. State the universal law of gravitation. F = \(G \frac{m M}{R^{2}}\) …..(1) What does a small value of G indicate? Why is ‘G’ called the universal gravitational constant? Why? Answer: v2 = 2gs = 2 × 9.8 × 100 = 1960 The earth attracts an apple. The weight of the body on the moon is about one-sixth of its weight on the earth. The acceleration produced in the motion of a body falling under the force of gravity is called acceleration due to gravity. Answer: The entire NCERT textbook questions have been solved by best teachers for you. Two bodies of masses 3 kg and 12 kg are placed at a distance 12 m. A third body of mass 0.5 kg is to be placed at such a point that the force acting on this body is zero. From the equation (1) and (2), we get 1. Class 9 | Science | Chapter 10 |Gravitation| NCERT Solutions. Question 3. (d) What is the ball’s acceleration at point C? [NCERT Exemplar] The mass of the Earth M is 5.98 x 1024 kg and the radius of the Earth R is 6.38 x 106 m. (3 marks) Previous: Contents: Next: Both the bodies fall with the same acceleration towards the surface of the earth. When body is at a distance V from centre of the earth then g = \(\frac{G M}{r^{2}}\). Numericals Answer: The ratio of their accelerations due to gravity at the surface is (R 1 /R 2) 2 (R 2 /R 1) 2 ... Click the "Score and Show Answer(s)" button for explanations. The entire NCERT textbook questions have been solved by best teachers for you. Question 2. Gravitation is the force of attraction between any two bodies while gravity refers to attraction between any body and the earth. We know that F = \(\frac{G M m}{r^{2}}\) as weight of a body is the force with which a body is attracted towards the earth, Time taken to reach the ground, t = 4 s Answer: Both stones will take the same time to reach the ground because the two stones fall from the same height. Question 2. Here, if the masses mx and m2 of the two bodies are of 1 kg and the distance (r) between them is 1 m, then putting m1 = 1 kg, m2 = 1 kg and r = 1 m in the above formula, we get Answer: = 0 – (0.5)2 = 2 × (-9.8) × h As the body falls back to the earth with the same velocity it was thrown vertically upwards. Become a part of our community of millions and ask any question that you do not find in our Gravitation Q&A library. Define acceleration due to gravity. , Difficult word of chapter the tale of melon city. The two bricks like a single body, fall with the same speed to reach the ground at the same time in case of free fall. A: mass of the object × gravitational acceleration B: Zero The way the world works is exciting. How is gravitation different from gravity? (i) Original weight = \(\frac{G M m}{r^{2}}\), where M is the mass of the earth. (ii) Putting the values in the formula v = u + gt We know from Newton’s second law of motion that the force is the product of mass and acceleration. So, the earth does not fall into the sun. t1 = \(\frac{u}{g}\) …(1) Therefore, the body appears to be floating weightlessly. Question 5. Answer. Gravitation Class 11 MCQs Questions with Answers. If the radius of the moon is 1.74 × 106 m, calculate the mass of the moon. Question 13. Then what will happen to your weight? or F = G × \(\frac{m_{1} m_{2}}{r^{2}}\) ……..(3) This force depends on the product of the masses of the planet and sun and the distance between them. (g) At which point does the bal 1 have the same speed as when it was thrown? (i) How high will it go before it begins to fall? Yes. A small value of G indicates that the force of gravitational attraction between two ordinary sized objects is a very weak force. Question 8. Answer: Let the mass, m3 = 0.5 kg be placed at a distance of ‘x’ m from m1, as shown in figure. Question 1. Give three differences between acceleration due to gravity (g) and universal gravitational constant (G). Dividing equation (1) by (2), we get Suppose the radius of the earth becomes twice of its present radius without any change in its mass, what will happen to your weight? Isaac Newton. Answer: This law states that every body in the universe attracts every other body with a force which is directly proportional to the product of their masses and inversely proportional to square of distance between them. The weight will become 16 times. Answer: The earth is acted upon by gravitation of sun, even though it does not fall into the sun. Do you agree with his hypothesis or not? We know that G = 6.67 × 10-11 Nm2 kg-2 Answer: Fill in the blanks : _____ of an object is the force of gravity acting on it.. Class 9 - Physics - Gravitation . u = 0 + gt2 It occurs only when a body is in a state of free fall under the effect of gravity alone. Calculate its speed after 2 s. Also find the speed with which the stone strikes the ground. Our online gravitation trivia quizzes can be adapted to suit your requirements for taking some of the top gravitation quizzes. Mention any four phenomena that the universal law of gravitation was able to explain. These Gravitation Objective Questions with Answers are important for competitive exams like JEE, NEET, AIIMS, JIPMER etc. Take g = 9.8 m/s2. Is weight a force? \(\frac{G \times M e \times m_{1}}{R^{2}}=\frac{G \times M_{e} \times m_{2}}{R^{2}}\) Here, s = 100 m, u = 0 Zero. t2 = u/g …(2) On what factors does that force depend? 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. How does the weight of an object vary with respect to mass and radius of the earth? Question 12. Answer: These questions are quite useful to prepare the objective type questions for … Velocity-time graph for the ball’s motion is shown in figure. Question 4. A comprehensive database of gravitation quizzes online, test your knowledge with gravitation quiz questions. or – 0.25 = -19.6 h Gravitational force between moon and the earth keeps moon in uniform circular motion around the earth. In order that a body of 5 kg weighs zero at … ... plz answer this questions. Answer: At what place on the earth’s surface is the weight of a body minimum? QUESTION 6 (2002 EXAM) (a) Calculate the magnitude of the gravitational acceleration g at the Earth's surface, using Newton's second law and the law of universal gravitation. Access Answers to NCERT Class 9 Science Chapter 10 – Gravitation ( All In text and Exercise Questions Solved) Exercise-10.1 Page: 134. Question 4. Answer: This hypothesis is not correct. When a body is thrown vertically upwards, what is its final velocity? Question 5. Answer: Asked by Umesh 1st December 2017 9:49 AM . Weight is the force of gravity acting on the body. Ratio will not change in either case because acceleration remains the same. Find the position of that point. or, v2 – 02 = 2(-10) × (-40) TopperLearning’s Experts and Students has answered all of Gravitation of MAHARASHTRA Class 10 Physics questions in detail. Answer: Calculate the value of acceleration due to gravity g using the relation between g and G. Why? The force (F) of gravitational attraction on a body of mass m due to earth of mass M and radius R is given by Page No: 134. Question 1. [NCERT Exemplar] Suppose that the radius of the earth becomes twice of its original radius without any change in its mass. Question 10. They both hit the ground at the same time. Wm = \(\frac{G M_{m} m}{R_{m}^{2}}\) …(1) So, both the stones will reach the ground at the same time when dropped simultaneously. A student thought that two bricks tied together would fall faster than a single one under the action of gravity. MCQs on CBSE Class 9 Science Chapter- Gravitation are provided here with answers. But we know, acceleration ∝ 1/m. Answer: Why does formation of tides takes place in sea or ocean? A ball is thrown up with a speed of 0.5 m/s. (3) In case of free fall acceleration does not depend upon mass and size. If a satellite of mass m is revolving around the earth with distance rfrom centre, then total energy is Answer: (c) The satellite revolving around the earth has two types of energies. At what place on the earth’s surface is the weight of a body maximum? The accepted value of G is 6.67x 1CT-11 Nm 2 kg-2. Answer: [NCERT Exemplar] Why can one jump higher on the surface of the moon than on the earth? NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12, Extra Questions for Class 9 Science Chapter 10 Gravitation. Question 14. Yes. The standard kilogram is the mass of a block of a platinum alloy kept at the international bureau of weights and measures near Paris in France. When r changes to 2r, the new weight is given by Answer: Find out the ratio of time they would take in reaching the ground. Answer: Enter OTP. If the mass of one body is doubled, force is also doubled. One second later, he throws another stone. Answer: On the moon’s surface, the acceleration due to gravity is 1.67 ms-2. State the universal law of gravitation. Here, g = 1.67 ms-2, R = 1.74 × 106 m and G = 6.67 × 10-2 Nm2 kg-2, Question 2. Answer: Here, initial velocity, u = 0 Question 2. It will remain the same on the moon, i.e., 9.8 kg. = M + \(\frac{10}{100}\)M = M + \(\frac{M}{10}\) = \(\frac{11M}{10}\) = 1.1 M (Where Ve is the volume of the earth) Weight of the same body on the earth’s surface will be (a) Downward So, when dropped from the same height a body reaches the ground quicker at the poles than at the equator. F ∝ m1 × m2…(1) Final speed, v = 0 Question 8. (d) Acceleration = 10 ms-2 Gravitational force. ∴ W = \(\frac{G M m}{r^{2}}\) Answer: [NCERT Exemplar] or D = \(\frac{g R^{2}}{G \frac{4}{3} \pi R^{3}}=\frac{3 g}{4 \pi G R}\), Question 6. Question 1. Therefore, the packets fall slowly at equator in comparison to the poles. Answer: F = mg …(2) Let P and Q be the two bodies, Zero. Then weight becomes Wn = mG \(\frac{4 M}{\left(\frac{R}{2}\right)^{2}}\) = (16 m G) \(\frac{M}{R^{2}}\) = 16 × W0 Answer: (i) We know v2 – u2 (a) In which direction is the ball moving at point C? Why does a body reach the ground quicker at poles than at the equator when dropped from the same height? That is, for the second stone, t = (3.16 – 1)s = 2.16s 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. When a body is dropped from a height, what is its initial velocity? For example, given the weight of, and distance between, two objects, you can calculate how large the force of gravity is between them. the mass of body P = m1 The earth attracts an apple. Question Answers, Page 134. Question 1. Answer: According to Newton’s third law of … Answer. New weight becomes 1.1 times. Draw areal velocity versus time graph for mars. Gravitational constant is numerically equal to the force of attraction between two masses of 1 kg that are separated by a distance of 1 m. radius of the earth, Re = 6400 km Using physics, you can calculate the gravitational force that is exerted on one object by another object. Question 9. 1. Answer: (d) The quantity G is universal constant of nature. The universal law of gravitation was able to explain successfully. 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. So, v2 = u2 + 2gs, Free Question Bank for NEET Physics Gravitation. Derive an expression for acceleration due to gravity in terms of mass of the earth (M) and universal gravitational constant (G). Similarly, the force of attraction between the earth and the body Q is given by Question 20. This test will determine your knowledge of the subject. This will clear students doubts about any question and improve application skills while preparing for board exams. CLASS 11 PHYSICS CHAPTER 8 GRAVITATION QUESTION ANSWERS, A star 2.5 times the mass of the sun and collapsed to a size of 12 km rotates with a [NCERT Exemplar] A force of 20 N acts upon a body whose weight is 9.8 N. What is the mass of the body and how much is its acceleration? Molecules in air in the atmosphere are attracted by gravitational force of the earth. F ∝ \(\frac{m_{1} \times m_{2}}{r^{2}}\) Acceleration due to gravity is the acceleration acquired by a body due to the earth’s gravitational pull on it. Its value also varies from one celestial body to another. The constant ‘G’ is universal because it is independent of the nature and sizes of bodies, the space where they are kept and at the time at which the force is considered. As u = 0, h1 = \(\frac{1}{2} g t_{1}^{2}\) Answer: ∴ For the second stone, Prove that if a body is thrown vertically upward, the time of ascent is equal to the time of descent. Answer: When does an object show weightlessness? (b) No. This is because acceleration due to gravity is independent of the mass of the falling body. Do not fall into the earth body appears to be floating weightlessly by body. Mass 1 kg B: gravitation questions and answers Kg-m/Sec 2 ) = N ] Q.19 weight of a body rise... Is 9.8 kg C: 9.8 kg on the moon begin to move if No celestial... ] Q.19 weight of free fall object is the same as the unit... A ball is thrown vertically upward, the second stone objects inside gravitation questions and answers outside water! 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Doubt of gravitation quizzes online, test your knowledge with gravitation quiz questions taken by body!, Archimedes ' Principle and Floatation Trivia quizzes can be adapted to suit your requirements for taking some the. Teachers, students and Kids Trivia quizzes can be adapted to suit your for! Also find the speed with which the stone strikes the ground at the same size are dropped simultaneously heights... Gravitation objectives questions with answers, can we say that their masses and distance between?... Given by ∴ new weight becomes 4 times ( B ) at which point is at a distance of m. Planet requires to revolve around the sun s universal law of gravitation able. Force of attraction between any two objects of masses ml and m2 having the same height objects inside and the! Keeps the moon, i.e., 9.8 kg mass and radius of the moon than on the earth acted... Can one jump higher on the earth not move towards the apple bodies fall with the same time when from. 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