32 Questions
According to Kepler's laws of planetary motion, what is the shape of the orbit that a planet follows around the sun?
Elliptical
What does Kepler's second law of planetary motion, the Law of areas, state about the speed of a planet?
It varies in such a way that the radius vector drawn from the sun to planet sweeps out equal areas in equal times
What does Newton's law of gravitation state about the force between particles?
It is directly proportional to the square of the distance between them
According to the characteristics of gravitational force, what is the nature of gravitational force between two bodies?
Radial
What does the universal constant of gravitation represent?
The force of attraction between two particles of unit mass each separated by unit distance
According to Kepler's laws, what is the magnitude of the force between two bodies?
Extremely small
What is the acceleration produced in a body on account of the force of gravity known as?
Acceleration due to gravity
How does the value of acceleration due to gravity change with altitude?
It gradually goes on decreasing
What is the space around a body within which its gravitational force of attraction is experienced by other bodies called?
Gravitational field
What is the intensity of the gravitational field of a body at a point in the field defined as?
The force experienced by a body of unit mass placed at that point
What is the gravitational potential at a point in the gravitational field of a body defined as?
The work done in bringing a body of unit mass from infinity to that point
What is the minimum velocity required to project a body vertically upward from the surface of the earth so that it comes out of the gravitational field of earth called?
Escape velocity
What is a body which is revolving continuously in an orbit around a much larger body called?
Satellite
What is the minimum velocity required to put a satellite into a given orbit around earth called?
Orbital velocity
What is the satellite having the same time period of called?
Geostationary Satellite
What is the work done in carrying a mass 'm' from infinity to a point at distance r called?
Potential energy
What is Kepler's first law of planetary motion?
Each planet revolves around the sun in an elliptical orbit with the sun at one of the foci of the ellipse.
According to Kepler's second law of planetary motion, what characteristic does the speed of a planet exhibit?
The speed of a planet varies in such a way that the radius vector drawn from the sun to the planet sweeps out equal areas in equal times.
What does Newton's law of gravitation state about the force between particles?
It states that 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.
What are the important characteristics of gravitational force between two bodies?
i) Gravitational force is a central force, acting along the line joining the centres of the interacting bodies. ii) It is independent of the nature of the intervening medium. iii) It does not depend upon the presence of other bodies. iv) It is valid for point objects and spherically symmetrical objects. v) The magnitude of the force is extremely small.
What is the universal constant of gravitation numerically equal to?
The force of attraction between two particles of unit mass each separated by unit distance.
What is the shape of the orbit that a planet follows around the sun, as per Kepler's laws of planetary motion?
Elliptical
What is the acceleration produced in a body on account of the force of gravity known as?
Acceleration due to gravity
What is the space around a body within which its gravitational force of attraction is experienced by other bodies called?
Gravitational field
What is the intensity of the gravitational field of a body at a point in the field defined as?
The force experienced by a body of unit mass placed at that point
What is the gravitational potential at a point in the gravitational field of a body defined as?
The amount of work done in bringing a body of unit mass from infinity to that point
What is the work done in carrying a mass 'm' from infinity to a point at distance r called?
Gravitational potential energy
How does the value of acceleration due to gravity change with altitude?
Gradually goes on decreasing
What is the minimum velocity required to project a body vertically upward from the surface of the earth so that it comes out of the gravitational field of earth called?
Escape velocity
What is a body which is revolving continuously in an orbit around a much larger body called?
Satellite
What is the minimum velocity required to put a satellite into a given orbit around earth called?
Orbital velocity
What is the satellite having the same time period of called?
Geostationary Satellite
Test your knowledge of Kepler's Laws of Planetary Motion and Newton's Law of Gravitation with this quiz. Explore the principles of planetary motion and gravitational force as formulated by Johannes Kepler and Sir Isaac Newton.
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