Gravitation — Flashcards
Madhya Pradesh Board · Class 9 · Science
24 flashcards for Gravitation (Madhya Pradesh Board Class 9 Science) to test yourself on key terms and facts. Sample: "What is gravitational force?"
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What is gravitational force?
Answer
Gravitational force is the force of attraction between any two objects in the universe. It acts along the line joining the centers of the two objects. For example, the Earth attracts an apple towards …
State Newton's Universal Law of Gravitation.
Answer
Every object in the universe attracts every other object with a force which is proportional to the product of their masses and inversely proportional to the square of the distance between them. The fo…
Write the mathematical formula for Newton's Law of Gravitation and explain each term.
Answer
F = GMm/d² Where: F = gravitational force between two objects G = universal gravitational constant (6.67 × 10⁻¹¹ N m² kg⁻²) M = mass of first object m = mass of second object d = distance between cent…
What is the value and SI unit of the universal gravitational constant G?
Answer
Value: G = 6.67 × 10⁻¹¹ N m² kg⁻² SI Unit: N m² kg⁻² (Newton meter squared per kilogram squared) G was experimentally determined by Henry Cavendish using a sensitive balance.
What is free fall? Give an example.
Answer
Free fall is the motion of an object under the influence of gravitational force alone. During free fall, objects fall towards Earth with acceleration due to gravity (g). Example: A stone thrown upward…
What is acceleration due to gravity? What is its value on Earth?
Answer
Acceleration due to gravity (g) is the acceleration experienced by any object during free fall due to Earth's gravitational pull. Its value on Earth is approximately 9.8 m/s². The direction is always …
Derive the formula for acceleration due to gravity in terms of G, M, and R.
Answer
From F = GMm/R² and F = mg Therefore: mg = GMm/R² Canceling m from both sides: g = GM/R² Where: G = universal gravitational constant M = mass of Earth R = radius of Earth…
Why do all objects fall at the same rate during free fall (ignoring air resistance)?
Answer
From g = GM/R², we see that acceleration due to gravity is independent of the mass of the falling object. It depends only on Earth's mass (M) and radius (R). Therefore, whether light or heavy, all obj…
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