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Assertion: The acceleration of a particle near the earth's surface differs slightly from the gravitational acceleration, $a_{g} = \frac{G M}{R^{2}}$ .
Reason: The earth is not a uniform sphere and because it rotates.

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Important Questions on Gravitation

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Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 5

Assertion : Kepler’s law of areas is equivalent to the law of conservation of angular momentum.
Reason : For planetery motion

\frac{d A}{d t} = \frac{L}{2 m}

= constant.

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Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 6

Assertion : For circular orbits, the law of periods is T²

\propto

r³, where M is the mass of sun and r is the radius of orbit.
Reason : The square of the period T of any planet about the sun is proportional to the cube of the semi-major axis a of the orbit.

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Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 7

Assertion: If rotation of earth about its own axis suddenly stops, then acceleration due to gravity will increase at all places on the earth.
Reason: At height

h

from the surface of earth, acceleration due to gravity is,

g_{h} = g (1 - \frac{2 h}{R_{e}})

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Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 8

Assertion :If the earth stops rotating about its axis, the value of the weight of the body at equator will decrease.
Reason : The centripetal force does not act on the body at the equator.

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Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 9

Assertion: Gravitational potential is maximum at infinity.
Reason: Gravitational potential is the amount of work done to shift a unit mass from infinity to a given point in gravitational attraction force field.

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Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 10

Assertion : A person feels weightlessness in an artificial satellite of the earth. However a person on the moon (natural satellite) feels his weight.
Reason : Artificial satellite is a freely falling body and on the moon surface, the weight is mainly due to moon’s gravitational attraction.

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Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 13

Assertion : The gravitational field of moon is much less than that of earth.
Reason : Gravitational field of a given mass (

M

) depends upon

\frac{M}{r^{2}}

, which is smaller for moon.

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Beta Question Bank for Medical: Physics>Chapter 11 - Gravitation>Exercise (Assertion & Reason)>Q 14

Assertion : In keplar’s law conservation of angular momentum does not take place.
Reason : Gravitation force acting between earth and the sun is perpendicular to line joining them.

Assertion: The acceleration of a particle near the earth's surface differs slightly from the gravitational acceleration, ag=GMR2. Reason: The earth is not a uniform sphere and because it rotates.

Important Questions on Gravitation

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Assertion: The acceleration of a particle near the earth's surface differs slightly from the gravitational acceleration, $a_{g} = \frac{G M}{R^{2}}$ .
Reason: The earth is not a uniform sphere and because it rotates.