# Physics – Concepts – Force, Pressure and Energy

Physics – Concepts – Force, Pressure and Energy |

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 is described as what is required to change velocity oracceleration 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 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 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 sea-level as a standard is: -
14.7 lbs/in ^{2} -
100 kPa -
1 bar -
760 mm Hg -
29.92 inches Hg
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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