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Gravitational and buoyancy force class 9 physics (science Book) Gravitation and the universal law of gravitation. The motion of objects under the influence of gravitational force on the earth. The weight of a body varies from place to place. Conditions for objects to float in liquids. 1.When we move from the poles to the equator. Hence, the value of ‘ g ’ decreases. Why Ans: The shape of earth is an ellipse so when we move from the poles to the equator the radius of the earth R increases.  Hence, the value of ‘ g ’ decreases because value 'g' is inversely proportional to the radius of earth. g = GM/R^2 2. How does the force of gravitation between two objects change when the distance between them is reduced to half? Answer: when the distance between the objects is reduced to half the gravitational force increases by four times the original force. 3.. The gravitational force acts on all objects in proportion to their masses. Why, then, a heavy object does not fall faster than a

CBSE PHYSICS: IX Motion And Rest Formative Check Points For FA-01.. : Q. Define terms (i) One radian (ii)  Angular displacement (iii) Angular velocity Answer: One radian is defined as the angle subtended at the centre of the circle by an arc equal in length to its radius. Angular displacement : In a circular motion, the angular displacement of a body is the angle subtended by the body at the centre in a given interval of time. It is represented by the symbol  q  (theta).                                Angular velocity : The angular displacement per unit time is called the angular velocity. it is represented by the symbol  w (omega). Angular velocity  w  =  q /t In figure, the arc AB of the circle has length  l   and subtends an angle  q  at the centre C Click on given link to read full post:   Check Points For FA-01

Question on  Class IX  »  Science  »  Gravitation  » The Universal Law Of Gravitation. Q.1. When we move from the poles to the equator. Hence, the value of ‘ g ’ decreases.  Why Ans: The shape of earth is an ellipse so when we move from the poles to the equator the radius of the earth R increases. Hence, the value of ‘   g   ’ decreases because value 'g' is inversely proportional to the radius of earth. g = GM/R 2 Q. 2. What is the diffrence between centrifugal force and centripetal force? Ans: Centripetal Force            (i) It is the force that keeps a body in circular path. (ii) It acts toward the center. Centrifugal Force (i) It is the pseudo force that tries to make a body fly off the circular path.  (ii) It acts outward the center. Q.3. Explain :Centrifugal force and Centripetal force? Ans: A force which is required to move a body uniformly in a circle is known a

Q1. Define force and its SI unit? Q 2. Distinguish between balanced and unbalanced force? Q3. State three laws of motion? Q 4. What is inertia? Is inertia vector quantity. Justify? Q5. What is impulse? Prove that Impulse is equal to change in momentum? Q. 6. Define momentum and Prove that F = ma Q 7. Is it possible that a body keeps on moving with uniform velocity with? If yes give reason also name scientist who explained this statement? Q 8. Why a person sitting in bus fall forward when moving bus suddenly stops? Q9. Why people sitting in bus fall backward when bus suddenly starts? Q10. Why dust fall on beating carpet with stick? Q11. Why leaves fall when we are shacking branch of tree? Q12. Why an athlete runs certain distance before taking long jump? Q13. When bus takes u turn, passengers sitting inside thrown a side. Why? Q14. Explain why it is difficult for a fireman to hold a hose, which ejects large amount of water at a high velocity. Q15. How a karate

9 th   physics:  Force and laws of Motion 1. An object of mass 2 kg is sliding with a constant velocity of 4 m/ s   on a frictionless horizontal table. The force required to keep the object moving with the same velocity is (a) 32 N               (b) 0 N                (c) 2 N                 (d) 8 N                  Ans: (b]        2. Rocket works on the principle of conservation of (a) mass              (b)energy            (c) momentum    (d) velocity          Ans:  [c] 3.A car is moving at 45 km/hr.A constant force acts on the car for 10 sc .So that it's velocity becomes 63 km/hr .The distance travelled by car during this interval of 10 sec is : a) 100 m         b) 150 m              c) 200 m        d) 50 m                       Ans:  [b]      4. What is the definition of balanced and unbalanced force? Ans:   When two equal forces acting on an object in opposite directions called balanced force.   When something does not move the forc

CBSE PHYSICS: IX Force and laws of motion solved questions: NCER... : Q.1: Which of the following has more inertia? (a) A rubber ball and a stone of the same size. (b) A bicycle and a train. (c) A five rupee c... Read more Related post you may also like IX Force and laws of motion solved questions: NCERT / CBSE Textbook Exercise Questions Solved NCERT solution Force and Law of motion for class 9 Guess Questions 2012 Ch-9 FORCE AND LAWS OF MOTION QUESTION BANK Class 9th Physics (Forces and Laws of motion) 9th Forces and Laws of motion teat paper-1 9th force and law of motion Test paper -2 9th Forces and Laws of motion teat papers unsolved CBSE PHYSICS Force and law of motion Numerical for class9 unsolved Solved Numerical Problems in 9th Force and Laws of motion

CBSE PHYSICS: Practice Papers Class IX Gravitation : 1. Sate Newton's law of motion. Derive it. 2. Define a) Gravitaty and an expression for acceleration due to gravity b) Pressure c) Free ... Read more Related post you may also like MCQ: Thrust, Pressure , Buoyancy and Density (9th physics) 9th physics Thrust and Pressure, Archimedes’ Principle, Relative Density key point Physics Assignment-I Chapter: Gravitation 9th CBSE PHYSICS Gravitation Chapter Notes Class IX Class 9th physics Notes on Gravitation CBSE Test Papers for Class 9 chapter Gravitation 9th Class - PHYSICS GRAVITATION TEST PAPER Class-ix-science-physics-gravitation solved Questions

CBSE PHYSICS: Practice Papers Class IX Gravitation : 1. Sate Newton's law of motion. Derive it. 2. Define a) Gravitaty and an expression for acceleration due to gravity b) Pressure c) Free ... CBSE PHYSICS

9th CBSE physics chapter motion and rest merit gainer Motion And Rest Physics Class IX CBSE chapter-wise MCQ Multiple Choice Questions,Test Paper,Sample paper on CCE pattern for class 9 science Motion. Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, equations of motion by graphical method; elementary idea of uniform circular motion. IX Physics Motion and Rest Notes Download File (source www.jsuniltutorial.weebly.com ) IX Physics Motion and Rest numerical Download File IX Physics Motion and Rest Test paper Download File For more educational stuff visit Link IX Motion and Rest Related search : CBSE- PHYSICS- IX- Motion and Rest Study notes CBSE PHYSICS class 9th Motion Numerical Problems unsolved You might also like: CBSE PHYSICS IX MOTION AND REST STUDY NOTES Guess Questions 2012 Ch-9 FORCE AN

CBSE PHYSICS: CBSE Work, Energy and Power IX Physics assignment 1. Under what conditions work is said to be done? 2. Derive the formula for work done by a constant force 3. Give few examples where energy is possessed by a body due to its change in shape. 4. State and prove the law of conservation of energy. 5. Is it possible that force is acting on a body but still work done is zero? Explain. 6. A rocket of mass 3x106 kg takes off from a launching pad and acquires a vertical velocity of 1km/s at an altitude of 25 km. calculate (a) the potential energy and (b) the kinetic energy. (g = 9.8m/s 2 ) 7. If a man lifts a load up with the help of a rope such that it raises the load of mass 50kg to a height of 20m in 100 sec. Find the power of man 8. A ball is dropped from a height of 5m. Find the velocity of the ball just before it reaches the ground. Do you require the value of mass to find the velocity? 9. Two persons A and B do same amount of work. The person A does