### force:

Echelon
* are diffraction gratings
  - military units
  - status
* band based in the great tundra of Minnesota.
* global network of surveillance sites.
* is allegedly the most sophisticated intelligence gathering organization in the world
  - perhaps the most powerful intelligence gathering organization in the world
* vast electronic spying network developed from systems used during the Cold War.
* vast, international surveillance system that monitors electronic communication.

Economic force
* are factors that affect consumer purchasing power and spending patterns.
* cause poverty.
* includes financial, economic, and infrastructure variables.
* influence business productivity, efficiency and profit opportunities.

Electric force
* accelerate particles.
* affect the charged particles and charged fluid in a self-consistent manner.
* are produced by electric charges either at rest or in motion
  - small
* can be either attractive or repulsive.
* cause it to move.
* is seen as the interaction among peaks and troughs
  - stronger than gravitational force

Electrical force
* are extremely sensitive to distance
  - responsible for holding our bodies' cells together
* is the attraction or repulsion between two objects due to their charge.
* universal force that exisits between two charged objects.

Electromagnetic force
* causes interaction between electricaly charged objects.
* comes into play when two charged particles come close.
* has to do with moving charges.
* is much stronger than gravity
  - proportional to electric charge
* long range force like gravity.
* work on particles which have electric charge.

Electrostatic force
* are foundational to our existence.
* cause the particle to adhere to the surface of the aluminum.
* caused by high voltage can masquerade as small weight changes.
* causes the capacitor to wobble back and forth as it charges and discharges.
* play a major role in determining the three-dimensional structures of proteins.

Environmental force
* continue to modify inborn potentials with each passing year.
* play a strong role in obesity.

Excessive force
* becomes an issue when police officers are unprepared for events.
* cause damage.
* is one of the main contributors to overuse symptoms and problems.

### force:

Exogenous force
* Many exogenous forces are as a result of other bodies in space.
+ Endogenous and exogenous: Earth sciences
  * Many exogenous forces are as a result of other bodies in space. For example, the Moon causes tides in the Earth's oceans and other big bodies of water. Impacts from comets and meteoroids change the surface of the Earth. When they strike the Earth, they create craters which are holes, which can be very big or small, in the ground. Radiation from the Sun can cause aurorae, which are lights that can be seen at night near the poles.

### force:

External force
* Most external forces cause external torque.
* Most external forces cause net external torque
* are either surface forces or body forces.
+ Stress (mechanics): Materials science :: Elasticity (physics) :: Mechanics :: Engineering
  * Stress is a measure of the internal forces in a body between its particles. These internal forces are a reaction to the external forces applied on the body that cause it to separate, compress or slide. External forces are either surface forces or body forces. Stress is the average force per unit area that a particle of a body exerts on an adjacent particle, across an imaginary surface that separates them.

Friction force
* generate electricity.
* have magnitudes.
* transfer energy.

Geological force
* are very slow and they matter most of all.
* can bury and alter sites.

Gravity force
* acting on a fish while it's out of the water can be harmful.
* are proportional to the amount of material needed to construct an object.
* is simply the weight of the flying system.