About Natural phenomena

1. Introduction
Some Natural Phenomena
By,
Bhavishya.M
Bhanupranaswi.p

2. CONTENTS:
 Natural Phenomena
 Lighting
 People’s beliefs on lightning
 Benjamin Franklin
 Charging by Rubbing
 Types of Charges
Facts of Lightning
 Protection from Lightning

3. Natural Phenomena
A Natural phenomena is a non- artificial event in the physical sense
therefore not produced by humans
Some common examples of Natural phenomena includes volcanic
eruptions, weather, decay etc..,
Natural phenomena such as Rains are relatively harmless so far as
humans are concerned

5. Now we are going to know about the LIGHTNING

6. Lightning
 Lightning is a very quick electrical discharge
that occurs between a cloud and the ground,
between two clouds, or within a cloud.
Lightning is also called as an electric spark, but
on a huge scale

7. People beliefs on Lighting And sparks
In Ancient times people didn’t understand the cause of the sparks
They were, therefore afraid of lightning and thought that the wrath of
Gods or Evil spirits was striking them
But Now of course we understand that lightning is caused by the
accumulation of charges in clouds

8. The Sparks that the Greeks knew about
 The Ancient Greeks of 600 BC knew that when Amber was rubbed with
the Fur , it attracts light objects such as hair
You might have also seen that your hair is attracted by the cloth of your
dress
If you take off these clothes in dark, you can even see the sparks and can
even hear the crackling sound

9. How Many of you know about The Person Who
DISCOVERED ELECTRICITY??

10. Benjamin Franklin
Benjamin Franklin was born on January 17,1706
As a scientist, he is best known for his experiments with
electricity
In 1752, Franklin showed that lightning and spark
formed are a part of the Natural phenomena

11. Does Charges Created By Rubbing ??

12. Charging by Rubbing (Friction);
 Some objects can be charged by rubbing with another object , when the
bodies are rubbed they attract light objects . This is called as Charging by
Rubbing
Ex:-Scale or Comb when rubbed with dry hair obtains charge on surface and
attracts pieces of papers
 The charges obtained by rubbing are static charges . They don’t move. When
charges move , it is electric current
Electric current is motion of charges through a conductor

14. Types of Charges ;
 There are 2 types of charges .They are positive charge and Negative charge
Two charged bodies may attract or repel each other
Like Similar charges repel each other and unlike charges attract each other

15. So lets us know about the interactions of charges
by some activities…..

16. Like charges Repel each other:
 Activity 1: Inflate 2 balloons and hang them in such a way that they don’t
touch each other. Rub both the balloons with a cloth and release them. They
repels each other
Activity 2: Rub a plastic refill with a polythene cover and place it in a glass
tumbler. Rub another plastic refill with polythene cover and bring it near
charged refill. They repel each other

17. Unlike charges attract each other:
 Activity : Charge a plastic refill by rubbing it with a polythene and
keep it in a glass tumbler . Change an Inflated balloon by rubbing with
a cloth and bring it near the charged plastic refill . They attract each
other

18.  By now you might have understood about the
charges .So now lets know about …..
Some Facts about lightning….

19.  Lightning is a real risk; an average of ten deaths and forty injuries from lightning
occur in Florida each year.
 Lightning strikes earth a 100 times each second
Average flash will light a 100 watt bulb for 3 months
Lightning is the second largest killer due to storms, exceeded only by floods
 Thunder is associated with lightning

20. Protection from Lightning
When You are in Outdoors:
 Carrying an umbrella is not safe
 If you are in forest take shelter under short trees
 If you are in a group, spread out to avoid the current traveling between
group members.
During a lightning storm, immediately find shelter in a substantial building
or a motor vehicle (windows closed)

22. When you are Indoor:
 Don't touch electrical equipment such as computers, TVs, or cords. You can
remote controls safety
 Stay off corded phones. You can use cellular or cordless phones.
 Avoid plumbing. Do not wash your hands, take a shower or wash dishes
 Do not lie on concrete floors or lean against concrete walls.

24. Safe Position during Lightning [If shelter Is not available]:

25. Any Queries ??

26. "The simple act of paying positive attention to
people has a great deal to do with productivity."