Force, pressure and Energy are some of
Physics basic
tenets. The following will hopefully serve as a
reminder of Physics 101.
Force
Pressure
Energy
Force:
Force is described as what is required to change
velocity or
acceleration of an objects  recall that
acceleration is any change in vector. The formula
for force is rather simple:
F = force required, given in
Newton's or Dyne's
m = the mass of the object, and
a =
acceleration
The Newton (named after Sir Isaac
Newton) is the amount required to move 1 kilogram at
a distance of 1 meter in 1 second  written as:
The equation of force is Newton's
second Law of
physics. The three laws are:

A body at rest must remain at
rest and a body in motion remains in motion
unless acted upon by an external force

A force (F) on a body (m) gives
it an
acceleration (a) in the direction on the
force, and is inversely proportional to the mass

Whenever a body exerts a force
from another body, that body exerts a force
equal in magnitude and in the opposite direction
of the initial mass.
Here is Newton's famous Force
equation:
Examples of force: Gravity and
Friction
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Pressure:
Pressure is very similar to Force, but applies
force over a particular area.
The units of this equation will be:
For comparison, 1 atmosphere (using
Earth's
atmosphere at sealevel as a standard is:

14.7 lbs/in^{2}

100 kPa

1 bar

760 mm Hg

29.92 inches Hg
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Energy:
Potential Energy (PE)  stored energy as a
result of position:
Kinetic Energy (KE)  energy of motion:
Energy Units:
 1 Joule (J) = Nm
 1 erg = dyne cm = 10^{7} J
 1 calorie = 4.186 J
 1 kilocalorie = 1 Calorie (food)
Power:
In order to determine power, we need to
determine the value of Work:
 Angle = 0 degrees if force and work are
in same direction
 Angle = 180 degree is force and work are
opposite direction
 Angle = 90 degrees if force is
perpendicular to work
Now we can find Power:
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