“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 Does the apple also attract the earth? Question 21. Answer: Take the Quiz and improve your overall Physics. 6.7 × 10-11 Nm2 kg-2) everywhere in the universe. The radius of the earth at the poles is 6357 km, the radius at the equator is 6378 km. Q.17 Does the gravitational force same for two objects inside and outside the water? Free PDF Download - Best collection of CBSE topper Notes, Important Questions, Sample papers and NCERT Solutions for CBSE Class 9 Physics Gravitation. Show that the weight of an object on the moon is \(\frac{1}{6}\) th of its weight on the earth. The earth is acted upon by gravitation of sun, even though it does not fall into the sun. Suppose the radius of the earth becomes twice of its present radius without any change in its mass, what will happen to your weight? A student thought that two bricks tied together would fall faster than a single one under the action of gravity. Zero. Why can one jump higher on the surface of the moon than on the earth? Differences between g andG. A: Yes B: No. Answered by Expert ICSE IX Physics Upthrust in Fluids, Archimedes' Principle and Floatation. , Difficult word of chapter the tale of melon city. Since, the two forces, i.e., Fp and FQ are equal, thus from (1) and (2), ∴ v = 0 + (-10) × 2 = -20 ms-1 This will clear students doubts about any question and improve application skills while preparing for board exams. Question 2. From the equation (1) and (2), we get Wm = \(\frac{G M_{m} m}{R_{m}^{2}}\) …(1) Page No: 134. A stone is dropped from the top of a 40 m high tower. h2 = \(\frac{1}{2} g t_{2}^{2}\), (2) Answer: 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. These Gravitation Objective Questions with Answers are important for competitive exams like JEE, NEET, AIIMS, JIPMER etc. (b) time of fall of the body? Acceleration, a = g = 9.8 m/s2 The radius of the earth is 6400 km and g = 10 m/s². Molecules in air in the atmosphere are attracted by gravitational force of the earth. (b) At which point is the bal 1 stationary? or, v2 – 02 = 2(-10) × (-40) Answer: or D = \(\frac{g R^{2}}{G \frac{4}{3} \pi R^{3}}=\frac{3 g}{4 \pi G R}\), Question 6. Question 2. i.e., the second stone was thrown downward with a speed of 12.1 ms-1. So, when dropped from the same height a body reaches the ground quicker at the poles than at the equator. Q1. [NCERT Exemplar] The value of ‘g’ at the equator of the earth is lesser than that at poles. ⇒ m1 = m2, Question 3. Here, initial velocity, u = 0 Initial speed, u = 0.5 m/s Define acceleration due to gravity. 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. \(\frac{W_{m}}{W_{e}}=\frac{M_{m}}{M_{e}} \times \frac{R_{e}^{2}}{R_{m}^{2}}\) …. Mass of the earth, Me = 6 × 1024 kg Answer: ⇒ Average density of the earth, D = \(\frac{\text { Mass }}{\text { Volume }}=\frac{g R^{2}}{G \times V e}\) 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. 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., But the acceleration due to gravity is represented by the symbol g. Therefore, we can write 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. (c) At which point is the bal 1 at its maximum height? Answer: Question 3. Question 5. Answer: 1. Answer: ∴ 49 = 0 × t + \(\frac{1}{2}\) × 9.8 × t2 Gravity itself is a natural phenomenon. Answer: And Radius of the earth, Re = 6.4 × 106 m. Question 7. Answer: For both the stones The weight will become 16 times. Given m1 = 3 kg; m2 = 12 kg W = \(\frac{G M m}{(2 r)^{2}}\) Both the bodies fall with the same acceleration towards the surface of the earth. Suppose that the radius of the earth becomes twice of its original radius without any change in its mass. u = 0 + gt2 Ratio will not change in either case because acceleration remains the same. Practice questions The gravitational force between […] Question 12. The astronaut and the spaceship are orbiting with same acceleration hence, the body does not exert any force on the sides of the spaceship. Comment. (e) What is the ball’s acceleration at point A? g = 9.8 ms-2, h = 49 m, t = 2.16 s, u = ? F ∝ m,1m2 and F ∝ \(\frac{1}{r^{2}}\) Final speed, v = 0 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) Solution: The universal law of gravitation states that every object in the universe attracts every other object with a force called the gravitational force. A: mass of the object × gravitational acceleration B: Zero GK Quiz on Gravitation How gravity works, what causes gravity, what is gravity made of, etc. Its value also varies from one celestial body to another. Register online for Science tuition on Vedantu.com to score more marks in your examination. Question 9. How is gravitation different from gravity? What keeps the moon in uniform circular motion around the earth? According to Newton’s third law of motion, action and reaction are equal and opposite. Isaac Newton. Answer: Using physics, you can calculate the gravitational force that is exerted on one object by another object. Gravitational force. It’s what keeps us safe on the ground, as opposed to floating up through the air. Answer: Now, mass of the earth, Me = 6 × 1024 kg A single one under the force of attraction between any two bodies depend upon masses... Q.17 does the force of attraction between two ordinary sized objects is a universal constant nature! 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