Gravitation — Flashcards
NIOS · Class 10 · Science & Tech
35 flashcards for Gravitation (NIOS Class 10 Science & Tech) to test yourself on key terms and facts. Sample: "What is Newton's law of gravitation?"
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What is Newton's law of gravitation?
Answer
Every particle in the universe attracts every other particle with a force. This force is proportional to the product of their masses and inversely proportional to the square of the distance between th…
Why does an apple fall towards the earth?
Answer
The earth attracts the apple due to gravitational force. This force pulls the apple downward, so it falls towards the earth. The same force also acts between all masses in the universe.
Why do objects of different masses fall at the same rate?
Answer
Acceleration due to gravity is independent of the mass of the falling body. So, when air resistance is small or removed, heavy and light objects fall together at the same place with the same accelerat…
What happens when a coin and a flat paper are dropped together?
Answer
The coin reaches the ground first because air resistance acts more on the larger surface of the paper. Air friction slows the paper more than the coin.
What happens when a coin and a crumpled paper ball are dropped together?
Answer
Both hit the ground at the same time because crumpling reduces the effect of air resistance. With air resistance reduced, both objects fall with nearly the same acceleration.
Why did Robert Boyle's coin-and-feather experiment work in a glass tube with air removed?
Answer
Without air, there is no air resistance. So the coin and the feather fall together and hit the bottom at the same time.
How does gravitational force change when the distance between two bodies becomes four times?
Answer
Since force is inversely proportional to the square of distance, making the distance 4 times reduces the force by 4^2 = 16 times. New force = old force / 16.
How does gravitational force change if the masses of both bodies are doubled?
Answer
Since force is proportional to the product of the two masses, doubling both masses makes the force 4 times larger. New force = 4 × old force.
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