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Answer: The radius of the earth is 6400 km and g = 10 m/s². Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Gravitation. Question 4. 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. W = $$\frac{G M m}{(2 r)^{2}}$$ The weight of the body on the moon is about one-sixth of its weight on the earth. Weightlessness is a state when an object does not weigh anything. 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. 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? Question 1. On what factors does that force depend? F = $$G \frac{m M}{R^{2}}$$ …..(1) Answer: Answer: Q1. Both C and D; [(Kg-m/Sec 2) = N] Q.19 Weight of free fall object is. TopperLearning’s Experts and Students has answered all of Gravitation of MAHARASHTRA Class 10 Physics questions in detail. = M + $$\frac{10}{100}$$M = M + $$\frac{M}{10}$$ = $$\frac{11M}{10}$$ = 1.1 M Answer: (b) At which point is the bal 1 stationary? Answer: Given, Mass of the Sun, M = 2 x 10 30 kg Show that the weight of an object on the moon is $$\frac{1}{6}$$ th of its weight on the earth. Question 6. Question 2. Question 11. Asked by Umesh 1st December 2017 9:49 AM . Who formulated the universal law of gravitation? (c) At which point is the bal 1 at its maximum height? Suppose gravity of earth suddenly becomes zero, then which direction will the moon begin to move if no other celestial body affects it? = $$\frac{G M m}{4 r^{2}}=\frac{W}{4}$$ [NCERT Exemplar] But the acceleration due to gravity is represented by the symbol g. Therefore, we can write Does the apple also attract the earth? Answer: or D = $$\frac{g R^{2}}{G \frac{4}{3} \pi R^{3}}=\frac{3 g}{4 \pi G R}$$, Question 6. t2 = u/g …(2) [NCERT Exemplar] Answer: Answer: According to Newton’s third law of … Why can one jump higher on the surface of the moon than on the earth? (Where Ve is the volume of the earth) So, v2 = u2 + 2gs, As per the universal law of gravitation, the force of attraction between the earth and the body P is given by, Practicing All Gravitation - IIT JEE Entrance Exam Questions and Answers in online helps you to improve your ability to attend the real time maths, chemistry, physics Entrance Exams. Yes. Question 5. New mass, M’=M + 10% of M From a cliff of 49 m high, a man drops a stone. Therefore, the body appears to be floating weightlessly. Question 3. Answer: State the universal law of gravitation. ∴ W = $$\frac{G M m}{r^{2}}$$ Since, the two forces, i.e., Fp and FQ are equal, thus from (1) and (2), When does an object show weightlessness? Answer: Question 5. Suppose that the radius of the earth becomes twice of its original radius without any change in its mass. Here, initial velocity, u = 0 It is denoted by ‘g’. The acceleration produced in the motion of a body falling under the force of gravity is called acceleration due to gravity. “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 Give reasons. Suppose the mass of the moon is Mm and its radius is Rm. But we know, acceleration ∝ 1/m. For the first stone ∴ F = ma When M changes to new mass M’ The force (F) of gravitational attraction on a body of mass m due to earth of mass M and radius R is given by Its SI unit is the same as the SI unit of force, i.e., Newton (N). Isaac Newton. Question 10. The earth is acted upon by gravitation of sun, even though it does not fall into the sun. Here are some practice questions that you can try. Gravitation Multiple Choice Questions & Answers for competitive exams. (i) Original weight = $$\frac{G M m}{r^{2}}$$, where M is the mass of the earth. 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. Gravity itself is a natural phenomenon. If the radius of the moon is 1.74 × 106 m, calculate the mass of the moon. Do you agree with his hypothesis or not? Physics: Multiple Choice Questions on Gravitation. Question 1. Find the percentage change in the weight of a body when it is taken from the equator to the poles. (b) time of fall of the body? We know that g = $$\frac{G M}{R^{2}}$$ or M = $$\frac{g R^{2}}{G}$$ Fp = $$\frac{G \times M_{e} \times m_{1}}{R^{2}}$$ …..(1) GK Quiz on Gravitation How gravity works, what causes gravity, what is gravity made of, etc. The mass of the Sun is 2 x 10 30 kg and that of the Earth is 6 x 10 24 kg. v2 = 2gs = 2 × 9.8 × 100 = 1960 Then force acting on m3 due to m1, is equal and opposite to the force acting on m3 due to m2. Question 5. Take g = 9.8 m/s2. Question 3. This force depends on the product of the masses of the planet and sun and the distance between them. What will happen to the gravitational force between two bodies if the masses of one body is doubled? ans F ∝ $$\frac{1}{r^{2}}$$ ..(2) The radius of the earth at the poles is 6357 km, the radius at the equator is 6378 km. t1 = $$\frac{u}{g}$$ …(1) ⇒ t = $$\sqrt{10}$$ = 3.16 s According to Newton’s third law of motion, action and reaction are equal and opposite. Does the apple also attract the earth? Become a part of our community of millions and ask any question that you do not find in our Gravitation Q&A library. 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, A: mass of the object × gravitational acceleration B: Zero How does the force of attraction between the two bodies depend upon their masses and distance between them? Zero. [NCERT Exemplar] or, v = $$\sqrt{800}$$ Answer: where Me = mass of earth and Re = radius of earth. Comment. 1. Weight is not a constant quantity. Answer: If it does, why does the earth not move towards the apple? Question 12. Answer: Suppose the radius of the earth becomes twice of its present radius without any change in its mass, what will happen to your weight? The entire NCERT textbook questions have been solved by best teachers for you. Both the bodies fall with the same acceleration towards the surface of the earth. Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Gravitation. Define acceleration due to gravity. the mass of body P = m1 Gravitation Class 9 Extra Questions Numericals. Answer: Initial velocity, u = 0 (e) Acceleration = -10 ms-2 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., We = $$\frac{G M_{e} m}{R_{e}^{2}}$$ …(2) mg = $$G \frac{m M}{R^{2}}$$ or g = $$\frac{G M}{R^{2}}$$ …(3) Answer: Thus, the packets will remain in air for longer time interval, when it is dropped at the equator. Answer: Question 19. Question Answers, Page 134. 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. 0 = u – gt1 If the mass of one body is doubled, force is also doubled. u = 0 + gt2 Answer: $$\frac{G \times M e \times m_{1}}{R^{2}}=\frac{G \times M_{e} \times m_{2}}{R^{2}}$$ MCQ quiz on Gravitation multiple choice questions and answers on gravitation MCQ questions quiz on gravitation objectives questions with answer test pdf. i.e., First stone would take 3.16 s to reach the ground. Answer: 3. If the earth attracts two objects with equal force, can we say that their masses must be equal? 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? Answer: Find out the ratio of time they would take in reaching the ground. Answer: Thus, equation (3) becomes, (2) Answer: (g) At which point does the bal 1 have the same speed as when it was thrown? 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. Answer: So, when dropped from the same height a body reaches the ground quicker at the poles than at the equator. Mass is the quantity of matter contained in the body. Give one example each of central force and non-central force. Two objects of masses ml and m2 having the same size are dropped simultaneously from heights h1 and h2, respectively. Answer: And Radius of the earth, Re = 6.4 × 106 m. Question 7. Acceleration due to gravity is the acceleration acquired by a body due to the earth’s gravitational pull on it. Acceleration, a = g = 9.8 m/s2 A student thought that two bricks tied together would fall faster than a single one under the action of gravity. Gravitation is the force of attraction between any two bodies while gravity refers to attraction between any body and the earth. Zero. Therefore, the packets fall slowly at equator in comparison to the poles. Question 14. Derive an expression for acceleration due to gravity in terms of mass of the earth (M) and universal gravitational constant (G). [NCERT Exemplar] Q.17 Does the gravitational force same for two objects inside and outside the water? or h = $$\frac{0.25}{19.6}$$ = 0.0127 m g = 9.8 ms-2, h = 49 m, t = 2.16 s, u = ? Justify your answer. Question 9. Gravitation Class 11 MCQs Questions with Answers. Answer: How does the weight of an object vary with respect to mass and radius of the earth? $$\frac{\iota_{1}}{t_{2}}=\sqrt{\frac{h_{1}}{h_{2}}}$$ 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. Answer: This test will determine your knowledge of the subject. ∴ v = u In case of free fall acceleration does not depend upon mass and size. ⇒ t2 = $$\frac{98}{9.8}$$ = 10 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. A stone is dropped from a cliff. And the mass of body Q=m2 Why is ‘G’ called the universal gravitational constant? The Following Section consists of Gravitation Questions on Physics. The acceleration due to gravity does not depend upon the mass of the stone or body. When r changes to 2r, the new weight is given by It is the measure of inertia of the body. ... plz answer this questions. State the universal law of gravitation. 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) Answer: A: Yes B: No. ⇒ Time of ascent = Time of descent. Weight is the force of gravity acting on the body. Question 7. Weight, W = mg, m = $$\frac{W}{g}$$, m = $$\frac{9.8}{9.8}$$ = 1 kg Question 7: Law of gravitation gives the gravitational force between (a) the earth and a point mass only 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. 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. A: 1 kg B: 9.8 kg C: 9.8 Kg-m/Sec 2 D: 9.8 N. Answer. v = u + gt2 Answer: Time taken to reach the ground, t = 4 s Answer: v = u + gt1 This will clear students doubts about any question and improve application skills while preparing for board exams. A comprehensive database of gravitation quizzes online, test your knowledge with gravitation quiz questions. Yes. 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, (ii) As v = u2 + 2 gs As u = 0, h1 = $$\frac{1}{2} g t_{1}^{2}$$ (ii) Putting the values in the formula v = u + gt 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. When a body is dropped from a height, what is its initial velocity? Answer: Initial speed, u = 0.5 m/s Question 21. As we know s = ut + $$\frac{1}{2}$$ gt2 Do fluids possess weight? Then what will happen to your weight? Question 4. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube. Calculate the average density of the earth in terms of g, G and R. (ii) Weight = $$\frac{G M m}{r^{2}}$$, where r is the radius of the earth. (G = 6.67 × 1011 Nm2kg-2) This is because acceleration due to gravity is independent of the mass of the falling body. MCQs on CBSE Class 9 Science Chapter- Gravitation are provided here with answers. State the universal law of gravitation. Velocity-time graph for the ball’s motion is shown in figure. Yes. Calculate the height of the building. On the moon’s surface, the acceleration due to gravity is 1.67 ms-2. Downward motion Why does a body reach the ground quicker at poles than at the equator when dropped from the same height? Question 1. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12, Extra Questions for Class 9 Science Chapter 10 Gravitation. Question 3. 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. Answer: Question 1. Question 1. [NCERT Exemplar] and radius of the moon, Rm = 1740 km Solution: The universal law of gravitation states that every object in the universe attracts every other object with a force called the gravitational force. These questions are quite useful to prepare the objective type questions for … (3) 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. A ball is thrown up with a speed of 0.5 m/s. Answer: Register online for Science tuition on Vedantu.com to score more marks in your examination. What is the source of centripetal force that a planet requires to revolve around the sun? It occurs only when a body is in a state of free fall under the effect of gravity alone. F = mg …(2) Question 15. Now, mass of the earth, Me = 6 × 1024 kg Here, g = 1.67 ms-2, R = 1.74 × 106 m and G = 6.67 × 10-2 Nm2 kg-2, Question 2. Its value also varies from one celestial body to another. Answer: Answer: Enter OTP. The way the world works is exciting. (d) What is the ball’s acceleration at point C? mass of the moon, Mm = 7.4 × 1022 kg Question 4. A stone is dropped from the top of a 40 m high tower. Zero. (a) No v = $$\sqrt{1960}$$m/s = 44.2 m/s. The earth attracts an apple. Height of the building, h = ? Why does formation of tides takes place in sea or ocean? At what place on the earth’s surface is the weight of a body maximum? What keeps the moon in uniform circular motion around the earth? ∴ For the second stone, Both stones will take the same time to reach the ground because the two stones fall from the same height. Give three differences between acceleration due to gravity (g) and universal gravitational constant (G). Calculate its speed after 2 s. Also find the speed with which the stone strikes the ground. It’s what keeps us safe on the ground, as opposed to floating up through the air. ⇒ m1 = m2, Question 3. 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