2. High air pressure
inside car tyres
helps it to support a
heavy load.
The pressure under
the feet makes them
sink into soft
ground.
Do you know ?
3. Increased
pressure inside a
pressure cooker
cooks the food
more quickly at a
high temperature.
Transfer of
medicine in a
saline solution to a
patient by
intravenous
infusion
Do you know ?
4. Pressure
• Pressure is force per unit areaDefine pressure
• Pressure= Force/ AreaPressure’s
formula
• The pressure of a given force
increases as the surface area
decreases
Relationship
between
pressure and
area
• Pascal (Pa) 1Pa =
1Nm-2
SI Units
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5. Pressure
The pressure acted by a force on a
surface depends on the area of the
surface.
The pressure on the surface depends on
the direction of the force ( only the
component of the force that is
perpendicular to the surface to
determine the pressure)
6. Skis have a large area to
reduce the pressure on the
snow so that they do not sink
in too far
A wide shoulder pad of a
heavy bag reduce the
pressure exerted on the
shoulder of the person
Application involving low pressure
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7. A sharp knife has a very small
surface area on its cutting edge
high pressure can be exerted to cut
the meat
Nails have very sharp ends with
very small surface areas. When a
force is applied to the head of a nail,
the pressure will drive its shape end
into a piece of wood easily
Application involving high pressure
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