PHYSICS
F O R C E
A N D
P R E S S U R E
What
is force???
And its types
WHAT
IS FORCE???
1. a push or pull that can cause an object to accelerate, decelerate, or change direction.
Types:
Frictional Forces. When an object changes its state motion, 'frictional force' acts upon. ...
Applied Force. ...
Gravitational Force.
Air resistance force.
Up thrust.
FRICTIONAL FORCE
• Frictional force is the force generated by two surfaces that contact and slide against each
other.
APPLIED FORCE
• a force that is applied to an object by a person or another object.
GRAVITATIONAL FORCE
• The gravitational force is a force that attracts any two objects with mass. We call the
gravitational force attractive because it always tries to pull masses together, it never pushes them
apart.
AIR RESISTANCE
• Air resistance is the force acting on an object that is moving through air flowing in
the opposite direction.
UP THRUST
• It is a force that pushes things upwards. This happens when a gas or liquid has
an object floating in it.
PRESSURE
• Pressure is an expression of force exerted on a surface per
unit area. : Pressure = Force / Area
HYDRAULIC PRESSURE
• Hydraulic pressure is the amount of force applied to a liquid or gas by a pump. It
is measured in pounds per square inch (PSI). Normal hydraulic pressure is between
3000 and 4000 psi.
LIQUID PRESSURE
• Liquid pressure is the increase in pressure at increasing depths in a
liquid. Form fluid = ρghula
GAS PRESSURE
• Gas pressure is the name given to the force exerted by gas particles
colliding with the wall of their container. PV = nRT
ATMOSPHERIC PRESSURE
• the pressure exerted by the weight of the atmosphere, which at sea level has a mean value of
101,325 pascals (roughly 14.6959 pounds per square inch).
Ph. = pressure at height h
P_0 = sea level pressure
g = acceleration due to gravity
k
= Boltzmann's constant (ideal gas constant divided by
Avogadro's number)
T
= absolute temperature
m = mass of one air molecule
THANKYOU