b What are (i) free fall, (ii) acceleration
due to gravity (iii) escape velocity (iv)
centripetal force ?
Answers
Answer:
(i) free fall is any motion of a body where gravity is the only force acting upon it.
(ii) Acceleration due to gravity is the acceleration that is gained by an object due to the gravitational force. Its SI unit is ms². It has a magnitude as well as direction. Thus it is a vector quantity.
(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) centripetal force is a force that makes a body follow a curved path. Its direction is always orthogonal to the motion of the body and towards the fixed point of the instantaneous center of curvature of the path.
Answer:
FREE FALL:- whenever objects fall towards the earth under this force alone, we say that object are in fall free.
ACCELERATION DUE TO GRAVITY:- Acceleration due to gravity is the acceleration that is gained by an object due to the gravitational force. Its SI unit is ms². It has a magnitude as well as direction. Thus it is a vector quantity.
ESCAPE VELOCITY:- the minimum speed that an object at a given distance from a gravitating body must have so that it will continue to move away from the body instead of orbiting about it.
CENTRIPETAL FORCE:- Centripetal force is defined as the force acting on a body that is moving in a circular path that is directed toward the center around which the body moves.
Explanation:
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