Physics
Grade-10
Easy
Question
Which of the following is true about the motion of the moon around the earth?
(a) The moon falls towards the center of the earth at every point of its motion
(b) The moon hits the surface of the earth
(c) It does not hit the surface of the earth because of the spherically curved surface
- Only (a) and (c) are correct
- Only (a) and (b) are correct
- Only (c) is correct
- All are correct
Hint:
Moon revolves around the earth. The speed of earth slows down initially.
The correct answer is: Only (a) and (c) are correct
The correct option is a)Only (a) and (c) are correct.
The gravitational pull of the Earth gives the Moon the centripetal force necessary to orbit the Earth. The energy of the rotation of the Earth on its own axis is gradually converted into the energy of the moon's orbital motion. Therefore, the rotation speed of the earth slows down, but the distance to the moon increases. This is the reason why the moon doesn't hit the surface of earth.
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Joseph wanted to study the dependence of the gravitational force of attraction between two bodies on the mass of one body. Therefore, he did the required calculations by keeping the mass of the first body and their distance of separation constant and simply varying the mass of the second body. He calculated the value of the gravitational force between those two bodies 10 times by taking different masses for the second body. He then plotted a graph of the calculated data taking the force along the y-axis and the mass of the second body along the x-axis. How would the graph look like?
Joseph wanted to study the dependence of the gravitational force of attraction between two bodies on the mass of one body. Therefore, he did the required calculations by keeping the mass of the first body and their distance of separation constant and simply varying the mass of the second body. He calculated the value of the gravitational force between those two bodies 10 times by taking different masses for the second body. He then plotted a graph of the calculated data taking the force along the y-axis and the mass of the second body along the x-axis. How would the graph look like?
scienceGrade8
