Class 11 Physics - ODISHA
Gravitation
The Chapter 'Gravitation' in Class 11 Physics under the Odisha (BSE) syllabus introduces students to the fundamental force of attraction in the universe. It covers Newton's Law of Gravitation, acceleration due to gravity (g) and its variation with altitude and depth, gravitational potential energy, and the motion of satellites including escape velocity and Kepler's laws of planetary motion. This chapter holds significant weight in board exams, forming the core foundation for mechanics and astrophysics problems, frequently featuring numericals and derivations.
Start Learning FreeKey Concepts
Newton's Law of Gravitation
Every particle in the universe attracts every other particle with a force directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
Acceleration due to Gravity (g)
The acceleration produced in a freely falling body due to the gravitational pull of the earth, denoted by g and varying slightly with latitude, altitude, and depth.
Escape Velocity
The minimum velocity required for an object to break free from the gravitational pull of a planet or moon and reach infinity.
Kepler's Laws of Planetary Motion
Three empirical laws describing the motion of planets around the sun: the law of orbits, the law of areas, and the law of periods.
Gravitational Potential Energy
The work done in bringing a body from infinity to a point in the gravitational field, given by the negative sign indicating a bound system.
Important Formulas
Board Exam Info
In the Odisha (BSE) Class 11 Physics board examinations, this chapter typically carries around 6 to 8 marks. Questions usually include short-answer questions on Kepler's laws, derivations for the variation of 'g' with height and depth, expressions for escape velocity, and 2-3 mark numerical problems.
Frequently Asked Questions
Why is gravitational potential energy always negative?
It is negative because the reference point (zero potential energy) is chosen at infinity, where forces are zero. As a body approaches a mass, work is done by the gravitational field, decreasing its potential energy below zero.
Does the value of 'g' remain the same everywhere on Earth?
No, 'g' changes because the Earth is not a perfect sphere (it bulges at the equator), it rotates on its axis, and 'g' varies with altitude and depth.
What is the difference between gravitational mass and inertial mass?
Inertial mass is a measure of an object's resistance to acceleration (F=ma), whereas gravitational mass determines the gravitational force experienced by the object in a gravitational field (F=mg).
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