Question

b What are (i) free fall, (ii) acceleration
due to gravity (iii) escape velocity (iv)
centripetal force ?​

Answer 1

Answer:

i. In Newtonian physics, free fall is any motion of a body where gravity is the only force acting upon it. In the context of general relativity, where gravitation is reduced to a space-time curvature, a body in free fall has no force acting on it.

ii. It was learned in the previous part of this lesson that a free-falling object is an object that is falling under the sole influence of gravity. A free-falling object has an acceleration of 9.8 m/s/s, downward (on Earth). ... The numerical value for the acceleration of gravity is most accurately known as 9.8 m/s/s.

iii. In physics, escape velocity is the minimum speed needed for a free, non-propelled object to escape from the gravitational influence of a massive body, that is, to achieve an infinite distance from it. Escape velocity is a function of the mass of the body and distance to the center of mass of the body

iv. a force that acts on a body moving in a circular path and is directed towards the centre around which the body is moving.

Answer 2

Answer:

1. centripetal force: the force acting on any moving in a circle and directed towards the centre of the circle is called as centripetal force
2. Acceleration due to gravity : The acceleration produced in a body under the influence of the force of gravity Alone is called acceleration of the gravity
3. Free fall: The motion of any object under the influence of the force of gravity Alone is called as free fall
4. Escape velocity: the minimum velocity with which a body should be projected from the surface of a planet or moon ,so that it escape from the gravitational influence of the planet or moon is called escape velocity

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