write a note on free fall
Answers
Answer:
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.
An object in the technical sense of the term "free fall" may not necessarily be falling down in the usual sense of the term. An object moving upwards would not normally be considered to be falling, but if it is subject to the force of gravity only, it is said to be in free fall. The moon is thus in free fall.
Answer:
whenever an object moves under the influence of the force of gravity alone it is said to be in the free fall. in free fall the initial velocity of the object is zero and goes on increasing due to the acceleration due to gravity of the earth. during free fall the frictional force due to the air opposes the motion of the objects and buoyant force also acts on the object. Thus true free fall is only possible in vacuum. for a freely falling object the velocity on reaching the Earth and the time taken for it can be calculated by using Newton's equations of motion . the moon and artificial satellites are moving only under the influence of gravitational force due to earth .Thus they are all in free fall