As the body falls back to the earth with the same velocity it was thrown vertically upwards. The acceleration due to gravity is more at the poles than at the equator. Calculate the average density of the earth in terms of g, G and R. Then what will happen to your weight? NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12, Extra Questions for Class 9 Science Chapter 10 Gravitation. Answer: v2 = 2gs = 2 × 9.8 × 100 = 1960 But the acceleration due to gravity is represented by the symbol g. Therefore, we can write 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, Do you agree with his hypothesis or not? According to Newton’s third law of motion, action and reaction are equal and opposite. (b) time of fall of the body? Answer: 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. Calculate the value of acceleration due to gravity g using the relation between g and G. 1. Question 3. Answer: or F = G × $$\frac{m_{1} m_{2}}{r^{2}}$$ ……..(3) Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. In order that a body of 5 kg weighs zero at … Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Physics: Multiple Choice Questions on Gravitation. g = 9.8 ms-2, h = 49 m, t = 2.16 s, u = ? i.e., the second stone was thrown downward with a speed of 12.1 ms-1. Find out the speed with which he threw the second stone. Answer: Justify your answer. Answer: State the universal law of gravitation. ∴ New weight becomes 4 times. OTP has been sent to your mobile number and is valid for one hour Ratio will not change in either case because acceleration remains the same. They both hit the ground at the same time. Is the time taken by a body to rise to the highest point equal to the time taken to fall from the same height? It occurs only when a body is in a state of free fall under the effect of gravity alone. What will happen to the gravitational force between two bodies if the masses of one body is doubled? Take the Quiz and improve your overall Physics. The universal law of gravitation was able to explain successfully. Give reasons. Answer: Weightlessness is a state when an object does not weigh anything. (a) No Question 1. Let P and Q be the two bodies, Question 5. or t = $$\frac{0.5}{9.8}$$ = 0.05 s. Question 11. , Difficult word of chapter the tale of melon city. Therefore, the body appears to be floating weightlessly. The entire NCERT textbook questions have been solved by best teachers for you. Identical packets are dropped from two aeroplanes—one above the equator and other above the north pole, both at height h. Assuming all conditions to be identical, will those packets take same time to reach the surface of earth? We know that G = 6.67 × 10-11 Nm2 kg-2 So, v2 = u2 + 2gs, Answer: Answer: Why can one jump higher on the surface of the moon than on the earth? (b) At point B On what factors does that force depend? 1. These questions are quite useful to prepare the objective type questions for … A stone is dropped from a cliff. Similarly, the force of attraction between the earth and the body Q is given by A: 1 kg B: 9.8 kg C: 9.8 Kg-m/Sec 2 D: 9.8 N. Answer. Since, the two forces, i.e., Fp and FQ are equal, thus from (1) and (2), Access Answers to NCERT Class 9 Science Chapter 10 – Gravitation ( All In text and Exercise Questions Solved) Exercise-10.1 Page: 134. Class 9 | Science | Chapter 10 |Gravitation| NCERT Solutions. Zero. Answer: (d) The quantity G is universal constant of nature. This force depends on the product of the masses of the planet and sun and the distance between them. v = $$\sqrt{1960}$$m/s = 44.2 m/s. If the earth attracts two objects with equal force, can we say that their masses must be equal? Question 2. If the radius of the earth becomes twice of its original radius, then Explain why all of them do not fall into the earth just like an apple falling from a tree. Q.18 What is the weight of a body of mass 1 kg? h = 1.27 cm What will be its speed when it has fallen 100 m? Why does a body reach the ground quicker at poles than at the equator when dropped from the same height? Question 5. Combining (1) and (2), we get the mass of body P = m1 Is weight a force? (b) At which point is the bal 1 stationary? or, v2 – 02 = 2(-10) × (-40) A stone is dropped from the top of a 40 m high tower. or D = $$\frac{g R^{2}}{G \frac{4}{3} \pi R^{3}}=\frac{3 g}{4 \pi G R}$$, Question 6. Answer. Velocity-time graph for the ball’s motion is shown in figure. 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. Question 9. ⇒ t = $$\sqrt{10}$$ = 3.16 s F ∝ $$\frac{m_{1} \times m_{2}}{r^{2}}$$ Get all questions and answers of Gravitation of MAHARASHTRA Class 10 Physics on TopperLearning. The position of required point is at a distance of 4 m from mass of 3 kg. If the radius of the moon is 1.74 × 106 m, calculate the mass of the moon. Give one example each of central force and non-central force. Answer: Question 7. Dividing equation (1) by (2), we get For example, given the weight of, and distance between, two objects, you can calculate how large the force of gravity is between them. Derive expression for force of attraction between two bodies and then define gravitational constant. The acceleration due to gravity does not depend upon the mass of the stone or body. The accepted value of G is 6.67x 1CT-11 Nm 2 kg-2. Does the apple also attract the earth? Prove that if a body is thrown vertically upward, the time of ascent is equal to the time of descent. This test will determine your knowledge of the subject. As the mass of the earth is very large as compared to that of the apple, the acceleration experienced by the earth will be so small that it will not be noticeable. ans F ∝ $$\frac{1}{r^{2}}$$ ..(2) Show that the weight of an object on the moon is $$\frac{1}{6}$$ th of its weight on the earth. Suppose the mass of the moon is Mm and its radius is Rm. (i) As v = u + gt Question 2. Question 2. Our online gravitation trivia quizzes can be adapted to suit your requirements for taking some of the top gravitation quizzes. 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) Question 7: Law of gravitation gives the gravitational force between (a) the earth and a point mass only When a body is dropped from a height, what is its initial velocity? Question 11. Do fluids possess weight? Question 15. A small value of G indicates that the force of gravitational attraction between two ordinary sized objects is a very weak force. 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. When r changes to 2r, the new weight is given by Question 5. Previous: Contents: Next: Answer: It is denoted by ‘g’. Mass of the earth, Me = 6 × 1024 kg As per the universal law of gravitation, the force of attraction between the earth and the body P is given by, So, both the stones will reach the ground at the same time when dropped simultaneously. 6.7 × 10-11 Nm2 kg-2) everywhere in the universe. Answer: Differences between g andG. 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. Question 13. part1, Page 1 When hypothetically M becomes 4 M and R becomes $$\frac{R}{2}$$. i.e., weight will be reduced to one-fourth of the original. Two planets of radii R 1 and R 2 have the same density. Question 1. Question 19. How does the weight of an object vary with respect to mass and radius of the earth? Answer: Let the mass, m3 = 0.5 kg be placed at a distance of ‘x’ m from m1, as shown in figure. Question 12. Answer: What is the source of centripetal force that a planet requires to revolve around the sun? Answer: Answer: For the second stone, Answer: Answer: 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. Given m1 = 3 kg; m2 = 12 kg Gravitational force. Question 1. This is because acceleration due to gravity is independent of the mass of the falling body. 3. Which stone would reach the ground first and why? As we know s = ut + $$\frac{1}{2}$$ gt2 For both the stones 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: (d) Acceleration = 10 ms-2 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. Mention any four phenomena that the universal law of gravitation was able to explain. Answer: Question 3. 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. Wm = $$\frac{G M_{m} m}{R_{m}^{2}}$$ …(1) Answer: What keeps the moon in uniform circular motion around the earth? Question 4. 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. = $$20 \sqrt{2}$$ms-1, Question 6. Answer: (3) […] (ii) As v = u2 + 2 gs (2) Fill in the blanks : _____ of an object is the force of gravity acting on it.. Class 9 - Physics - Gravitation . F = mg …(2) $$\frac{W_{m}}{W_{e}}=\frac{M_{m}}{M_{e}} \times \frac{R_{e}^{2}}{R_{m}^{2}}$$ …. Draw areal velocity versus time graph for mars. Page No: 134. Q1. A: Yes B: No. Answer: Both the bodies fall with the same acceleration towards the surface of the earth. Answer: Downward motion Mass is the quantity of matter contained in the body. If you are a student of class 9 who is using NCERT Textbook to study Science, then you must come across Chapter 10 Gravitation. If a body of mass m is placed on the surface of moon, then weight of the body on the moon is Where, R is the distance of the body from the centre of the earth. Enter OTP. We = $$\frac{G M_{e} m}{R_{e}^{2}}$$ …(2) The weight will become 16 times. Thus, equation (3) becomes, 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. Question 1. In case of free fall acceleration does not depend upon mass and size. Answer: G = F TopperLearning’s Experts and Students has answered all of Gravitation of MAHARASHTRA Class 10 Physics questions in detail. Question 1. [NCERT Exemplar] If the mass of one body is doubled, force is also doubled. Here are some practice questions that you can try. v = u + gt2 Yes, fluids have weight. Define acceleration due to gravity. And the mass of body Q=m2 and radius of the moon, Rm = 1740 km This will clear students doubts about any question and improve application skills while preparing for board exams. Register online for Science tuition on Vedantu.com to score more marks in your examination. Free Question Bank for NEET Physics Gravitation. We know that g = $$\frac{G M}{R^{2}}$$ or M = $$\frac{g R^{2}}{G}$$ i.e., First stone would take 3.16 s to reach the ground. Molecules in air in the atmosphere are attracted by gravitational force of the earth. Question 9. The weight of the body on the moon is about one-sixth of its weight on the earth. Question 10. The ‘G’ is a universal constant, i.e., its value is the same (i.e. (G = 6.67 × 1011 Nm2kg-2) If the small and big stones are dropped from the roof of a house simultaneously, they will reach the ground at the same time. When does an object show weightlessness? (Where Ve is the volume of the earth) Thus, the packets will remain in air for longer time interval, when it is dropped at the equator. mass of the moon, Mm = 7.4 × 1022 kg Question 4. Answer: At what place on the earth’s surface is the weight of a body maximum? [NCERT Exemplar] Answer: Why is ‘G’ called the universal gravitational constant? Q.17 Does the gravitational force same for two objects inside and outside the water? Answer: (a) Downward This hypothesis is not correct. ∴ v = u Initial velocity, u = 0 Height of the building, h = ? Answer: Answer: Find out the ratio of time they would take in reaching the ground. t2 = u/g …(2) Prove that if the earth attracts two bodies placed at same distance from the centre of the earth with the same force, then their masses are equal. % Variation in the weight of a body = % Change in g = 0.7%. Answer: Question 3. Question 5. The acceleration produced in the motion of a body falling under the force of gravity is called acceleration due to gravity. Free Question Bank for 11th Class Physics Gravitation Gravitation Conceptual Problems Question 6. 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. The force (F) of gravitational attraction on a body of mass m due to earth of mass M and radius R is given by From the equation (1) and (2), we get In a hypothetical case, if the diameter of the earth becomes half of its present value and its mass becomes four times of its present value, then how would the weight of any object on the surface of the earth be affected? Observe the graph and answer the following questions. Answer: Numericals 1. 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. Answer: The value of ‘g’ at the equator of the earth is lesser than that at poles. Answer: 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 radius of the earth at the poles is 6357 km, the radius at the equator is 6378 km. ∴ For the second stone, It also implies that a body orbiting in space has zero weight with respect to a spaceship. The astronaut and the spaceship are orbiting with same acceleration hence, the body does not exert any force on the sides of the spaceship. (e) What is the ball’s acceleration at point A? Suppose that the radius of the earth becomes twice of its original radius without any change in its mass. It is the measure of inertia of the body. Zero. Answer: Define the standard kilogram. The way the world works is exciting. 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. 0 = 0.5 – 9.8t No. From a cliff of 49 m high, a man drops a stone. When body is at a distance V from centre of the earth then g = $$\frac{G M}{r^{2}}$$. Then force acting on m3 due to m1, is equal and opposite to the force acting on m3 due to m2. Question 8. The huge collection of Questions and Answers for academic studies, CBSE school. At the poles. Acceleration, g = – 9.8 m/s2 If the mass of a body is 9.8 kg on the earth, what would be its mass on the moon? Answer: Weight of an object is directly proportional to the mass of the earth and inversely proportional to the square of the radius of the earth, i.e., t1 = $$\frac{u}{g}$$ …(1) And Radius of the earth, Re = 6.4 × 106 m. Question 7. Question 2. Zero. On the moon’s surface, the acceleration due to gravity is 1.67 ms-2. (ii) Weight = $$\frac{G M m}{r^{2}}$$, where r is the radius of the earth. Practice questions The gravitational force between […] Gravitational force between moon and the earth keeps moon in uniform circular motion around the earth. GK Quiz on Gravitation How gravity works, what causes gravity, what is gravity made of, etc. One second later, he throws another stone. Question 4. = M + $$\frac{10}{100}$$M = M + $$\frac{M}{10}$$ = $$\frac{11M}{10}$$ = 1.1 M [NCERT Exemplar] The radius of the earth is 6400 km and g = 10 m/s². Suppose the radius of the earth becomes twice of its present radius without any change in its mass, what will happen to your weight? (b) No. Question 10. Asked by Umesh 1st December 2017 9:49 AM . Question 1. “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 the square of the distance between them.” Let us consider two bodies A and B of masses m1 and m2 which are separated by a distance r. Then the force of gravitation (F) acting on the two bodies is given by where Me = mass of earth and Re = radius of earth. Answer: Given, Mass of the Sun, M = 2 x 10 30 kg Answer: or h = $$\frac{0.25}{19.6}$$ = 0.0127 m How does the force of attraction between the two bodies depend upon their masses and distance between them? Using physics, you can calculate the gravitational force that is exerted on one object by another object. (a) In which direction is the ball moving at point C? Answer. The mass of the Sun is 2 x 10 30 kg and that of the Earth is 6 x 10 24 kg. or, v = $$\sqrt{800}$$ These Gravitation Objective Questions with Answers are important for competitive exams like JEE, NEET, AIIMS, JIPMER etc. (c) At point B Very Short Answer Type Questions. Solution: The universal law of gravitation states that every object in the universe attracts every other object with a force called the gravitational force. 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. Question 3. [NCERT Exemplar] The Following Section consists of Gravitation Questions on Physics. h2 = $$\frac{1}{2} g t_{2}^{2}$$, Both stones will take the same time to reach the ground because the two stones fall from the same height. (f) What is the bal l’s acceleration at point B? 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. Yes. Question 20. W = $$\frac{G M m}{(2 r)^{2}}$$ A comprehensive database of gravitation quizzes online, test your knowledge with gravitation quiz questions. Acceleration in downward direction = g Both C and D; [(Kg-m/Sec 2) = N] Q.19 Weight of free fall object is. ⇒ Average density of the earth, D = $$\frac{\text { Mass }}{\text { Volume }}=\frac{g R^{2}}{G \times V e}$$ 1. Here, initial velocity, u = 0 Question 16. u = 0 + gt2 Weight, W = mg, m = $$\frac{W}{g}$$, m = $$\frac{9.8}{9.8}$$ = 1 kg It will remain the same on the moon, i.e., 9.8 kg. Derive an expression for acceleration due to gravity in terms of mass of the earth (M) and universal gravitational constant (G). Original weight, W0 = mg = mG $$\frac{M}{R^{2}}$$ Does the apple also attract the earth? From (1) and (2), we get t1 = t2 Here, s = 100 m, u = 0 Why does formation of tides takes place in sea or ocean? Gravitation Class 11 MCQs Questions with Answers. F ∝ m,1m2 and F ∝ $$\frac{1}{r^{2}}$$ ∴ v = 0 + (-10) × 2 = -20 ms-1 Question 4. $$\frac{G \times M e \times m_{1}}{R^{2}}=\frac{G \times M_{e} \times m_{2}}{R^{2}}$$ Question 7. i.e., weight will increase by 10%. Assume that g = 10 m/s2 and that there is no air resistance. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Gravitation. Question 14. Final speed, v = 0 (d) What is the ball’s acceleration at point C? ... plz answer this questions. What does a small value of G indicate? = $$\frac{G M m}{4 r^{2}}=\frac{W}{4}$$ Time taken to reach the ground, t = 4 s Kerala Plus One Physics Chapter Wise Questions and Answers Chapter 8 Gravitation Plus One Physics Gravitation One Mark Questions and Answers Question 1. When a body is thrown vertically upwards, what is its final velocity? 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. Its value also varies from one celestial body to another. Initial speed, u = 0.5 m/s F = $$G \frac{m M}{R^{2}}$$ …..(1) Question 8. [NCERT Exemplar] (i) We know v2 – u2 Comment. 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, As u = 0, h1 = $$\frac{1}{2} g t_{1}^{2}$$ Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Gravitation. Question 1. 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. The entire NCERT textbook questions have been solved by best teachers for you. (ii) Putting the values in the formula v = u + gt That is, for the second stone, t = (3.16 – 1)s = 2.16s v = u + gt1 Here, g = 1.67 ms-2, R = 1.74 × 106 m and G = 6.67 × 10-2 Nm2 kg-2, Question 2. [NCERT Exemplar] How much do you know about gravitation? Answer: Question 1. Answer: According to Newton’s third law of … Question 18. Suppose gravity of earth suddenly becomes zero, then which direction will the moon begin to move if no other celestial body affects it? 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. MCQs on CBSE Class 9 Science Chapter- Gravitation are provided here with answers. Answer: Question 21. If it does, why does the earth not move towards the apple? Question 4. New weight becomes 1.1 times. Answer: Answer: MCQ quiz on Gravitation multiple choice questions and answers on gravitation MCQ questions quiz on gravitation objectives questions with answer test pdf. It does not weigh anything is 1.67 ms-2 of descent and answers ( Q & library... A universal constant, i.e., 9.8 kg go before it begins to fall from roof! Centripetal force that a planet gravitation questions and answers to revolve around the earth remain in air the. 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