Question

Example 3.5 Free-fall : Discuss the
motion of an object under free fall. Neglect
air resistance. Explain free fall​

Answer 1

Answer:

In Newton physics, free fall is any motion of a body where gravity is the only force acting upon it. ... 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.

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Answer 2

$\huge{\tt\red{Free\:Fall}}$

• 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 might not normally be considered to be falling, but if it is subject to only the force of gravity, it is said to be in free fall. The Moon is thus in free fall around the Earth, though its orbital speed keeps it in very far orbit from the Earth's surface.

Example ;

A ball fall freely under gravitational force alone i.e. $\sf 9.8\:ms^{-2}$

$\setlength{\unitlength}{2mm}\begin{picture}(0,0)\thicklines\put(3,6){\circle{3}}\put(2.9,4.5){\vector(0,-3){2cm}}\put(-3.9,-10){\line(3,0){3cm}}\multiput(-3.5,-10)(0.8,0){18}{\line(1,-2){2mm}}\put(-3.7,0){ \sf\footnotesize 9.8 ms^{-2} }\put(6,0){\vector(0,3){1.2cm}}\put(5.5,6){\line(3,0){2mm}}\put(5,-1.2){\sf\footnotesize height}\put(6,-2){\vector(0,-3){1.2cm}}\put(5.5,-8){\line(1,0){2mm}}\end{picture}$