Clear your doubts and get step by step answers to the questions asked in the Xam Idea Class 9 textbook. Suppose gravity of earth suddenly becomes zero, then which direction will the moon begin to move if no other celestial body affects it? Upthrust or buoyant force in the upward direction. Define acceleration due to gravity. 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. Find the apparent loss in weight of the body. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be (a) \(\frac{1}{4}\) times (b) 4 times (c) \(\frac{1}{2}\) times (d) unchanged. (i) As v = u + gt It also implies that a body orbiting in space has zero weight with respect to a spaceship. The value of ‘G’ is same at every point on the Earth. or t = \(\frac{0.5}{9.8}\) = 0.05 s. Question 11. Do fluids possess weight? The universal law of gravitation was able to explain successfully. The value of is different at different points on the Earth. Answer: Initial speed, u = 0.5 m/s Check below the important MCQs on CBSE Class 9 Science Gravitation: 1. Here we have provided NCERT Exemplar Problems Solutions along with NCERT Exemplar Problems Class 9.. (b) time of fall of the body? 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, Gravitation Objective GK Questions and Answers. 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. Gravitation CBSE Class 9 Science Chapter 11 - Complete explanation and Notes of the chapter 'Gravitation'.. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12, Extra Questions for Class 9 Science Chapter 10 Gravitation. [NCERT Exemplar] The entire NCERT textbook questions have been solved by best teachers for you. 1. At what place on the earth’s surface is the weight of a body minimum? Answer: or F = G × \(\frac{m_{1} m_{2}}{r^{2}}\) ……..(3) So, v2 = u2 + 2gs, The gravitational force between two bodies of unit masses separated by a init distance is known as universal gravitational constant. = M + \(\frac{10}{100}\)M = M + \(\frac{M}{10}\) = \(\frac{11M}{10}\) = 1.1 M ⇒ m1 = m2, Question 3. NCERT Solutions for Class 9 Science Chapter 10 - Gravitation [FREE]. \(\frac{G \times M e \times m_{1}}{R^{2}}=\frac{G \times M_{e} \times m_{2}}{R^{2}}\) To design hydrometers to find the density of liquids. The weight of the body on the moon is about one-sixth of its weight on the earth. Weight of the same body on the earth’s surface will be Broad handles are provided in bags and suitcases so that the area of contact increases. According to Newton’s third law of motion, action and reaction are equal and opposite. If the radius of the moon is 1.74 × 106 m, calculate the mass of the moon. Question 15. or, v2 – 02 = 2(-10) × (-40) SI Unit of pressure is (a) Pascal (b) Newton (c) Dyne (d) barye Answer. Question 5. If the mass of one body is doubled, force is also doubled. Why? 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 from Newton’s second law of motion that the force is the product of mass and acceleration. “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 If the small and big stones are dropped from the roof of a house simultaneously, they will reach the ground at the same time. Question 16. Question 18. What is the source of centripetal force that a planet requires to revolve around the sun? When M changes to new mass M’ Class 9 Physics Notes - Chapter 5 - Gravitation - Numerical Problems. Therefore, the packets fall slowly at equator in comparison to the poles. Answer: A small value of G indicates that the force of gravitational attraction between two ordinary sized objects is a very weak force. Comment. (f) Acceleration = 10 ms-2 A stone is dropped from the top of a 40 m high tower. For both the stones It occurs only when a body is in a state of free fall under the effect of gravity alone. Question 1: A body weights 700 g wt. Question 1. This reduces the pressure exerted by the weight of the bag or the suitcase. ⇒ Average density of the earth, D = \(\frac{\text { Mass }}{\text { Volume }}=\frac{g R^{2}}{G \times V e}\) (d) thrust. ∴ F = ma Both stones will take the same time to reach the ground because the two stones fall from the same height. NCERT Exemplar Class 9 Science is very important resource for students preparing for IX Board Examination. How does the weight of an object vary with respect to mass and radius of the earth? (ii) Putting the values in the formula v = u + gt v = u + gt1 Numerical problems worksheet on Gravitation and gravitational force. And the mass of body Q=m2 MCQ Questions for Class 9 Science Chapter 10 Gravitation with Answers MCQs from Class 9 Science Chapter 10 – Gravitation are provided here to help students prepare for their upcoming Science exam. (c) At which point is the bal 1 at its maximum height? Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Gravitation. Initial velocity, u = 0 Download CBSE Class 9 Physics Gravitation MCQs in pdf, Physics chapter wise Multiple Choice Questions free, Question: The mass of an object isa) The amount of matter contained in the object, independent of where that object is foundb) the force of gravity on that object located at a particular point in spacec) dependent on whether the object is on the Earth or elsewhere.d) Height of the building, h = ? New mass, M’=M + 10% of M Calculate the average density of the earth in terms of g, G and R. If it does, why does the earth not move towards the apple? Question 5. Question 19. where G is a constant known as universal gravitational constant. Question 3. = \(20 \sqrt{2}\)ms-1, Question 6. So, both the stones will reach the ground at the same time when dropped simultaneously. On what factors does that force depend? (c) 10 kg. ∴ 49 = 0 × t + \(\frac{1}{2}\) × 9.8 × t2 Multiple Choice Questions (MCQs) Question 1: Two objects of different masses falling freely near the surface of moon would (a) have same velocities at any instant (b) have different accelerations (c) experience forces of same magnitude (d) undergo a change in their inertia Answer: Question 10. Question 1. (ii) As v = u2 + 2 gs Question 11. The Universal Law of gravitation was coined by Sir Issac Newton. What would happen to your weight? As we know s = ut + \(\frac{1}{2}\) gt2 Gravitation Class 9 Extra Questions HOTS (Higher Order Thinking Skills) Question 1. What will be its speed when it has fallen 100 m? So, acceleration = \(\frac{\text { Force }}{\text { Mass }}=\frac{20}{1}\) = 20 m/s2, Question 3. Calculate the height of the building. The product of the earth is acted upon by Gravitation of sun, even though it does not fall the! 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