NCERT Solutions for Class 9 Science Chapter 10
Important NCERT Questions
Gravitation
NCERT Books for Session 2022-2023
CBSE Board and UP Board
Exercises Questions
Page No-144
Questions No-8
What is the acceleration of free fall?
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When objects fall towards the Earth under the effect of gravitational force alone, then they are said to be in free fall. Acceleration of free fall is 9.8 ms−2, which is constant for all objects (irrespective of their masses).
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The acceleration of free fall, symbolized by g , characterizes the rate at which an object accelerates when falling freely under the influence of gravity near the Earth’s surface. It signifies the swiftness with which an object’s velocity increases as it descends towards the Earth.
Near the surface of the Earth, the average value for this acceleration is approximately 9.81meters per second² or 9.81m/s² . This implies that for every second an object is in free fall, its speed augments by 9.81m/s
Although slight variations in g might occur due to factors like location, altitude, or geographical disparities, 9.81m/s² serves as a common average for gravitational acceleration near the Earth’s surface.
This acceleration value holds immense importance in physics, especially in scenarios involving free-falling objects, projectile motion, and gravitational phenomena. It serves as a foundational constant, offering insights into the impact of gravity on objects in proximity to the Earth and enabling the comprehension of various gravitational-related phenomena.