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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?
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
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 ______.
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Match the following concepts with their definitions:
Match the following concepts with their definitions:
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Study Notes
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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Description
Explore the concepts of gravitation, the universal law that explains the attraction between objects in the universe, and the effects of gravity on Earth. This quiz covers the gravitational constant, the phenomena induced by gravity, and how weight is calculated. Test your understanding of these fundamental principles of physics!
