Free Fall
Chapter Name : Gravitation |
Sub Topic Code : 101_09_10_02_03 |
Topic Name : Free Fall |
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Sub Topic Name : Motion Of Objects Under The Influence Of Gravitational Force Of The Earth |
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Introduction
Due to the gravitational pull of the earth, the acceleration on the objects under this force is constant. Thus, in the absence of air (Presence of air causes air drag), the time taken for the flight depends on distance alone. They reach the ground at same time.
Pre-Requisites:
Gravity, Universal Law of Gravity
Activity:
From a certain height release a tennis ball and ping ball. Which one would touch the ground first?
Real Life Question:
In the absence of air, an iron block and a bid weather will reach the ground at the same time if they fall from same height. How is that possible?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Gravity | Force that attracts you to Earth. |
| Acceleration due to gravity | g = 9.8 ms-1 |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Simulation Software | It can be used to create a virtual motion of the objects. Observe that there is no relationship between the mass of an object and its velocity/acceleration of its fall |
Real life uses :
The motion of objects under the influence of gravity like that of sky divers etc.
Places to visit :
Local Science Museum, exhibit on gravity
Practical examples around us
| Examples | Explainations |
|---|---|
| Firing of cannon ball | Though the motion is projectile and not purely vertical, the characteristic path is due to gravity only. |
What you learn in Theory:
Acceleration of an object due to gravity is independent of mass
What you learn in Practice:
Practically demonstrate the above principal and also suggest sources of error. (frictional and resistive forces).