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Mindmap: Gravitation | Physics Class 11 - NEET

The document Mindmap: Gravitation | Physics Class 11 - NEET is a part of the NEET Course Physics Class 11.
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FAQs on Mindmap: Gravitation - Physics Class 11 - NEET

1. What is the law of universal gravitation?
Ans. The law of universal gravitation, formulated by Sir Isaac Newton, states that every point mass attracts every other point mass in the universe with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. This can be mathematically expressed as F = G * (m1 * m2) / r², where F is the gravitational force, G is the gravitational constant, m1 and m2 are the masses of the objects, and r is the distance between their centers.
2. How does gravity affect time?
Ans. Gravity affects time through a phenomenon known as gravitational time dilation, which is a concept from Einstein's theory of general relativity. In stronger gravitational fields, time runs slower compared to weaker gravitational fields. This means that a clock closer to a massive object, like a planet or a star, will tick more slowly than a clock that is farther away. This effect, although very small in everyday scenarios, has been confirmed by experiments and is significant in the context of satellites and GPS technology.
3. What are the effects of gravity on Earth?
Ans. Gravity on Earth has several effects, including keeping the atmosphere in place, causing objects to fall towards the ground, and influencing ocean tides through the gravitational pull of the Moon and the Sun. It also plays a crucial role in maintaining the orbits of planets, moons, and artificial satellites around the Earth, ensuring stability in their paths.
4. What is the relationship between mass and weight?
Ans. Mass and weight are related but distinct concepts. Mass is a measure of the amount of matter in an object, typically measured in kilograms, while weight is the force exerted by gravity on that mass. Weight can be calculated using the formula W = m * g, where W is weight, m is mass, and g is the acceleration due to gravity (approximately 9.81 m/s² on Earth). Thus, an object's weight can change depending on the gravitational pull acting on it, while its mass remains constant.
5. Can gravity be considered a force?
Ans. Yes, gravity can be considered a force, particularly in the context of Newtonian physics. It is the attractive force that pulls objects toward one another based on their mass. However, in Einstein's general theory of relativity, gravity is described as the curvature of spacetime caused by mass. This means that rather than being a force in the traditional sense, gravity affects the motion of objects moving along the curved paths in spacetime.
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