State any one phenomenon related to the universal law of gravitation.
Q.1. State any one phenomenon related to the universal law of gravitation.
Ans. Motion of planets around the sun.
Q.2. State universal law of gravitation.
Ans. It states that the force of attraction between two masses is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centres.
Q.3. A body projected horizontally moves with the same horizontal velocity although it is under the action of the force of gravity, why ?
Ans. The force of gravity acts in the vertically downward direction and has no effect on the horizontal component of velocity; this makes the body move with uniform horizontal velocity.
Q.4. When an object, say an apple falls towards the earth, the earth rises up to meet it. Is this true? If so why is the earth’s motion not noticeable?
Ans. The statement is true. The mass of the earth is very large as compared to the mass of the apple. Therefore, the acceleration produced in the earth is hardly noticeable.
Q.5. A body of mass 10 kg is taken to the centre of the earth. What will its mass there?
Ans. The mass of the body will remain 10 kg as it is independent of the place.
Q.6. What will happen if the force of gravity disappears suddenly ?
Ans. All objects will be in a state of floatation due to the centrifugal force acting on them.
Q.7. A body projected horizontally moves with the same horizontal velocity although it is under the action of the force of gravity, why?
Ans. The force of gravity acts in the vertically downward direction and has no effect on the horizontal component of velocity; this makes the body move with uniform horizontal velocity.
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