PPT: Pressure, Winds, Storms, and Cyclones | Science Curiosity Class 8 - New NCERT PDF Download

 Page 1


Pressure, Winds,
Storms, and
Cyclones
Page 2


Pressure, Winds,
Storms, and
Cyclones
The SI unit of pressure is
newton/metre² (N/m²), also called
pascal (Pa).
Pressure
Pressure is defined as the force per unit area:
When the same force acts on a smaller area, it creates higher pressure. When it
acts on a larger area, it creates lower pressure.
SI Unit
When the area over which a force
is applied is smaller, the resulting
pressure is higher, making it easier
to perform certain tasks.
Effect of Area on Pressure
Page 3


Pressure, Winds,
Storms, and
Cyclones
The SI unit of pressure is
newton/metre² (N/m²), also called
pascal (Pa).
Pressure
Pressure is defined as the force per unit area:
When the same force acts on a smaller area, it creates higher pressure. When it
acts on a larger area, it creates lower pressure.
SI Unit
When the area over which a force
is applied is smaller, the resulting
pressure is higher, making it easier
to perform certain tasks.
Effect of Area on Pressure
Pressure in Daily Life
Sharp Objects
Knives cut easily because their
sharp edge concentrates force
on a very small area, creating
high pressure.
Pointed Tools
Nails penetrate wood easily
because their pointed end
concentrates force on a tiny
area, creating extremely high
pressure.
Carrying Loads
Buckets with broad handles
and cloth pads under head-
carried loads distribute weight
over larger areas, reducing
pressure and discomfort.
Broader Straps of Bags: Bags with broad straps are more comfortable than those with narrow straps
because the same weight is distributed over a larger area, reducing pressure on shoulders.
Page 4


Pressure, Winds,
Storms, and
Cyclones
The SI unit of pressure is
newton/metre² (N/m²), also called
pascal (Pa).
Pressure
Pressure is defined as the force per unit area:
When the same force acts on a smaller area, it creates higher pressure. When it
acts on a larger area, it creates lower pressure.
SI Unit
When the area over which a force
is applied is smaller, the resulting
pressure is higher, making it easier
to perform certain tasks.
Effect of Area on Pressure
Pressure in Daily Life
Sharp Objects
Knives cut easily because their
sharp edge concentrates force
on a very small area, creating
high pressure.
Pointed Tools
Nails penetrate wood easily
because their pointed end
concentrates force on a tiny
area, creating extremely high
pressure.
Carrying Loads
Buckets with broad handles
and cloth pads under head-
carried loads distribute weight
over larger areas, reducing
pressure and discomfort.
Broader Straps of Bags: Bags with broad straps are more comfortable than those with narrow straps
because the same weight is distributed over a larger area, reducing pressure on shoulders.
Pressure Exerted by Liquids 
1 Liquids Exert Pressure 
Liquids don't just sit there - they apply
force in all directions!
2 Pressure at the Bottom 
The weight of the liquid creates higher
pressure at the bottom of containers.
3 Pressure on the Sides 
Liquids also push outwards on the
sides of their containers.
4 Pressure Increases with
Height 
The taller the liquid column, the greater
the pressure it exerts.
Page 5


Pressure, Winds,
Storms, and
Cyclones
The SI unit of pressure is
newton/metre² (N/m²), also called
pascal (Pa).
Pressure
Pressure is defined as the force per unit area:
When the same force acts on a smaller area, it creates higher pressure. When it
acts on a larger area, it creates lower pressure.
SI Unit
When the area over which a force
is applied is smaller, the resulting
pressure is higher, making it easier
to perform certain tasks.
Effect of Area on Pressure
Pressure in Daily Life
Sharp Objects
Knives cut easily because their
sharp edge concentrates force
on a very small area, creating
high pressure.
Pointed Tools
Nails penetrate wood easily
because their pointed end
concentrates force on a tiny
area, creating extremely high
pressure.
Carrying Loads
Buckets with broad handles
and cloth pads under head-
carried loads distribute weight
over larger areas, reducing
pressure and discomfort.
Broader Straps of Bags: Bags with broad straps are more comfortable than those with narrow straps
because the same weight is distributed over a larger area, reducing pressure on shoulders.
Pressure Exerted by Liquids 
1 Liquids Exert Pressure 
Liquids don't just sit there - they apply
force in all directions!
2 Pressure at the Bottom 
The weight of the liquid creates higher
pressure at the bottom of containers.
3 Pressure on the Sides 
Liquids also push outwards on the
sides of their containers.
4 Pressure Increases with
Height 
The taller the liquid column, the greater
the pressure it exerts.
Pressure Exerted by Air
The envelope of air surrounding Earth is called the
atmosphere. This atmospheric air contains nitrogen,
oxygen, argon, carbon dioxide, and other gases in small
quantities.
Atmospheric Pressure Explained
Air exerts pressure in all directions. This
omnipresent force surrounding us is
known as atmospheric pressure,
constantly pushing on all surfaces.
Atmospheric pressure decreases at
higher altitudes and increases on the
plains.