Hewitt Chapter 9 Gravity

The value of ‘g’

• Increases as we go above the earth’s surface

• Decreases as we go to the centre of the earth

• Remains constant

• Is more at equator and less at poles

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Two objects of different masses falling freely near the surface of moon would

• have same velocities at any instant

• have different accelerations

• experience forces of same magnitude

• undergo a change in their inertia

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NGSS.HS-PS2-1

Two particles are placed at some distance. If the mass of each of the two particles is tripped, keeping the distance between them unchanged, the value of gravitational force between them will be

• 1/9 times

• 9 times

• 6 times

• 1/6 times

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NGSS.HS-PS2-4

On the earth, a stone is thrown from a height in a direction parallel to the earth’s surface while another stone is simultaneously dropped from the same height. Which stone would reach the ground first and why?

• free fall will reach first

• body with horizontal motion reach first

• both will reach at same time

• never reach ground

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NGSS.HS-PS2-4

Identical packets are dropped from two aeroplanes, one above the equator and the other above the north pole, both at height h. Assuming all conditions are identical, will those packets take same time to reach the surface of earth.

• at poles reaches early

• at equator reaches early

• reaches at equal rate at poles and equator

• never reach earth

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NGSS.HS-PS2-4

The masses of two planets are in the ratio 1 : 2. Their radii are in the ratio 1 : 2. The acceleration due to gravity on the planets are in the ratio

• 1 : 2

• 2:1

• 1:4

• 4:1

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A man can jump to a height of 1.5 m on a planet A. What is the height he may be able to jump on another planet whose mass and radius are, double to the planet A

• 1.5 m

• 3.0 m

• 4.5 m

• 6.0 m

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NGSS.HS-PS2-4

A satellite of the earth is revolving in a circular orbit with a uniform speed v. If the gravitational force suddenly disappears, the satellite will

• Continue to move with velocity v along the original orbit

• Move with a velocity v, tangentially to the original orbit

• Fall down with increasing velocity

• Ultimately come to rest somewhere on the original orbit

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NGSS.HS-PS2-1

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How does the mass weight of an object vary with respect to mass and radius of the earth. In a hypothetical case, if the diameter of the earth becomes half of its present value and its mass becomes four times of its present value, then how would the weight of any object on the surface of the earth be affected?

• m,w

• 16m,w

• m,16w

• 16m,16w

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NGSS.HS-PS2-4

An object falls through a distance h in certain time on the earth. The same object falls through a distance 4h in the same time on a planet. If 'g' is acceleration due to gravity on the earth, acceleration due to gravity on that planet is

• g/4

• 4 g

• g/2

• 2 g

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