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Questions and Answers
What does the universal law of gravitation state about the force of attraction between two objects?
What does the universal law of gravitation state about the force of attraction between two objects?
- It remains constant regardless of distance.
- It is directly proportional to the product of their masses. (correct)
- It is inversely proportional to the product of their masses.
- It is directly proportional to the sum of their masses.
The value of the gravitational constant G depends on the temperature and medium of the objects.
The value of the gravitational constant G depends on the temperature and medium of the objects.
False (B)
What is the acceleration due to gravity (g) on the surface of the Earth?
What is the acceleration due to gravity (g) on the surface of the Earth?
9.8 m/s^2
The weight of an object is equal to its mass times the acceleration due to ______.
The weight of an object is equal to its mass times the acceleration due to ______.
Match the following concepts with their definitions:
Match the following concepts with their definitions:
Flashcards
What is Gravitation?
What is Gravitation?
The force of attraction between any two objects in the universe. This force depends on their masses and the distance between them.
What is the Universal Law of Gravitation?
What is the Universal Law of Gravitation?
The force of attraction between two objects is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
What is the value of 'g'?
What is the value of 'g'?
The acceleration due to gravity, denoted by 'g', is approximately 9.8 m/s². This means an object falling freely near the Earth's surface accelerates at this rate.
What is Weight?
What is Weight?
The force with which the Earth attracts an object. It's calculated by multiplying mass and the acceleration due to gravity.
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What is Buoyancy?
What is Buoyancy?
The upward force exerted by a fluid on an object immersed in it. The magnitude of this force is equal to the weight of the fluid displaced by the object (Archimedes' principle).
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Gravitation
- Gravitation is the force of attraction between any two objects in the universe.
- The force of attraction is directly proportional to the product of the masses of the objects and inversely proportional to the square of the distance between them.
- The force acts along the line joining the centers of the two objects.
- Gravitational constant (G) is 6.673 x 10-11 Nm2/kg2. This value is constant, independent of the medium or temperature.
Universal Law of Gravitation Explanations
- Explains phenomena like the Earth's pull on us, the Moon orbiting Earth, and the planets orbiting the Sun.
Gravity on Earth
- Gravity is the force of attraction between the Earth and any object.
- Acceleration due to gravity (g) is 9.8 m/s2.
- The value of g decreases as you move away from the Earth's surface or go deeper into the Earth.
Weight
- Weight is the force with which the Earth attracts an object.
- Weight = mass × acceleration due to gravity.
- Weight on the Moon is 1/6th of the weight on Earth.
Thrust and Pressure
- Thrust is a force acting perpendicularly on a surface.
- Pressure is the thrust per unit area.
- SI unit of pressure is the pascal (Pa)
Buoyancy
- Buoyancy is the upward force exerted by a fluid on an immersed object.
- Archimedes' principle: the buoyant force equals the weight of the displaced fluid.
Relative Density
- Relative density is the ratio of the density of a substance to the density of water at 4°C.
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