Examples

# Examples of Force

The Force is that “push” that modifies the static balance of the body, to act on it, directing it to a form of movement or altering its displacement.The Force has been initially explained by the English physicist Isaac Newton , in one of his Laws.

## Second law of Newton

Newton’s Second Law is what explains the Force as the momentum required for a body with a certain mass to take a certain acceleration . An equation is established for this law, which is stated:

F = m * a

Force is the product of the mass of the body and the acceleration it takes in its movement.

The bodies by themselves, having a mass, exert a Force called Weight (W) . This is the force that allows it to remain “anchored” to the planet’s surface, thanks to the acceleration of gravity.

## Force of gravity

The Gravitation is the characteristic of the planet and all celestial bodies that causes the next bodies are attracted to its surface . The extent of this attraction is called the Gravitational Field.

The Force of Gravity can be considered synonymous with the Weight of the Bodies, since they are the ones who exert the force thanks to the Acceleration of Gravity (g) , which is something different.

The acceleration of gravity is the one taken by a body close to planet Earth, and has a value of 9.81 m / s 2 . It means that every second the velocity of the body in free fall increases by 9.81 m / s. Newton’s second law is applied to calculate the Force with which bodies are supported on the surface of the planet.

The Equation to calculate the Weight of a body is:

W = m * g

## Electrostatic force

The electrostatic force is similar to that of gravity, and is the one exerted by electrically charged particles when they are close to each other.

The electrostatic force is present between subatomic particles , which are protons, neutrons, and electrons.

The nucleus of the atom is made up of protons and neutrons. Protons have a positive electrical charge. Neutrons have no charge.

Electrons, which are negatively charged subatomic particles, are orbiting around the nucleus.

The positive charges of the protons , agglomerated with the neutrons in the nucleus, are offset by the negative charges of the electrons .

According to the Principles of Electrostatics, charges of opposite sign attract each other, so all the particles, protons, electrons and neutrons, will remain constituting the atom and obeying the structure.

Thanks to electrostatic forces, electrons are not detached from the periphery of the atom.

## Cohesion force

The cohesion force is the one that makes the constituent particles of a substance (whether it is in a solid, liquid or gaseous state) are close enough and attracting each other to consolidate the substance.

In a gas, the cohesion forces are very small , so its atoms or molecules are fluttering in the container that contains them. If there is no container to confine them, they will be free and will rise up into the atmosphere, uncontrollably.

In a liquid the cohesion forces are medium , so its atoms or molecules are relatively united. If there is a container that contains them, the liquid substance will take the geometric shape of it, and will cover a volume thus determined. If the container tips or breaks, the liquid will flow until it reaches static equilibrium, that is, until it stops moving.

The liquid Mercury is the one that has the greatest cohesion forces, since, for example, if it is manipulated with a pen or sheet, all its matter always rejoins, without getting to wet those objects.

In a solid the cohesion forces are great , so its atoms or molecules are highly united. They occupy a volume by themselves and do not flow. They have an established geometric shape, either regular or irregular.

## Centrifugal force

The Centrifugal Force is experienced by bodies subjected to a circular motion . When acceleration is applied to them, there is such a push that the body tends to move out of the circular path . This tendency increases when the acceleration becomes greater.

This is the case, for example, with juices in a blender. With the force of the knife, the liquid would be thrown out. The Centrifugal Force is there. However, it is the glass of the blender that defines this movement, and then the liquid does not escape.

## Centripetal force

The Centripetal Force is also experienced by bodies subjected to circular motion . When acceleration is applied to them, there is a push towards the center of the circle that compensates for the Centrifugal Force, keeping the body on a uniform, circular path. Thus the balance of forces is generated in circular motion.

The clearest example of the Centripetal Force occurs in the solar system. The Sun is the celestial body with the greatest gravitation, so the planets will be attracted during their elliptical trajectory, compensating for the Centrifugal Force that would make them take off into the void.

## Examples of Force

The Electrostatic Force was observed by Henry Cavendish on the torsion balance, thus he studied electrical charges.

The Electrostatic Force is the one that binds electrons to the atom, their negative charges being attracted by the positive charges of the protons in the nucleus.

The Centrifugal Force is used in the discus throw, in the Olympic games.

The Centripetal Force is that exerted by the hands when supporting the body on the bars, when turning in them in the Olympic games.

The Centripetal Force is the one that supports the planets rotating around the Sun without deviating.

Force is what is applied to the Lever to lift an object heavier than we can move.

Strength is what opposes weights in the gym, when we lift them.

Force is the one that opposes an object that slides on an inclined plane, to prevent it from reaching another point.

Force is what is applied to the pulleys to lift heavy objects.

The Cohesion Forces of liquid Mercury are the largest among liquids.