         Introduction Astronomy Tools Concepts 1. Electromagnetic Spectrum 2. Atmosphere Limitations 3. Space Observations Equipment 1. Telescopes 2. Radio 3. Space Tools 4. Photography 5. Spectroscopy 6. Computers 7. Advanced Methods 8. Radio Astronomy Basic Mathematics Algebra Statistics Geometry Scientific Notation Log Scales Calculus Physics Concepts - Basic Units of Measure - Mass & Density - Temperature - Velocity & Acceleration - Force, Pressure & Energy - Atoms - Quantum Physics - Nature of Light Formulas - Brightness - Cepheid Rulers - Distance - Doppler Shift - Frequency & Wavelength - Hubble's Law - Inverse Square Law - Kinetic Energy - Luminosity - Magnitudes - Convert Mass to Energy - Kepler & Newton - Orbits - Parallax - Planck's Law - Relativistic Redshift - Relativity - Schwarzschild Radius - Synodic & Sidereal Periods - Sidereal Time - Small Angle Formula - Stellar Properties - Stephan-Boltzmann Law - Telescope Related - Temperature - Tidal Forces - Wien's Law Constants Computer Models Additional Resources 1. Advanced Topics 2. Guest Contributions 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. If you need help with writing articles like this one, read writepaperfor.me reviews about one of the best writing helpers. 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 Back to Top 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 sea-level as a standard is: 14.7 lbs/in2 100 kPa 1 bar 760 mm Hg 29.92 inches Hg Back to Top 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:       Search | Site Map | Appendix ©2004 - 2020 Astronomy Online. All rights reserved. Contact Us. Legal. The works within is licensed under a Creative Commons Attribution-ShareAlike 3.0 Unported License.