# Forces of Nature

By | 13/11/2016

With all of this philosophical talk, I thought we could take a different step towards talking about the forces, and instead, talk about scientific forces.

Force is an external interaction, that, when acted upon an object, it results in causing a halt to a momentum of the object in motion, or, it can cause there to be motion to a body that was at rest, or it can completely change the direction of that object in motion. In essence, all forces end up being classified either into two categories: CONTACT forces or NON-CONTACT Forces.

Contact Forces includes those forces which is acted upon on an object by physical contact. The forces that will be included in these list that we will determine are:

• Frictional force
• Tensional force
• Normal force
• Air Resistance force
• Applied force
• Spring force

The branch of Non-Contact forces includes those types of forces which are acted on barring any involvement of physical contact. Essentially, what this list looks like is:

• Gravitational force
• Electrical force
• Magnetic force

So this essentially will include the forces in nature that are defined by the laws of this universe as we currently know it.

Force can be interpreted to mean an interaction that when it is applied on a body of a certain mass results in the change of it’s velocity which means it produces an acceleration in it. The greater a force, the more the acceleration that is produced in it. Forces can be categorized in a broad fashion and say these laws are simply defined by nature. Some of the defined laws are interpreted as:

• Applied Force : Applied forces are those types of forces which are applied at manual force by a person on an object. For example, a force that is applied on a desk to be pushed would be defined as an applied force. This force is also considered a contact force. • Gravitational Force : This is the force by which the massive objects like Earth, Sun and moon attracts objects towards what we believe to be it’s center. Practically every knwon object in the universe is attracted to each other but what we know is that it is likely experienced due to the massive size of the objects. It is actually the weight of the object pulled down by the body.

• Normal Force : Normal force is essentially the type of force that is supporting an object. An example of this is if you consider a book that is resting on a surface, such as a desk or a table. The surface of the desk or table is exerting a force upward to the book which balances and supports the weight of the object. A normal force can also be considered in this situation, horizontally, the two objects exert forces when in contact. This is true also if you consider a person who leans against the wall, the wall also balances the force of the person and exerts a force horizontally to the person.
• Frictional Force : Friction force is the type of force that a surface of an object puts on another object as it moves across it. The two different types of frictional force, they are friction-force sliding, and static friction. It’s not always true, but usually that a frictional force will push in opposition against the object’s motion. Think of the example of the book on top of the desk again, except that the book is now sliding over the surface of the desk instead of resting. Once it slides, it exerts a force, frictional force against the desk that it is moving across. The resulting friction comes from the objects slightly being pressed together due to external forces, and this causes what is called an intermolecular attractive force between the molecules of the two surfaces. Friction depends on the two surfaces’ nature and how hard they are pressed together.

• Air Resistance Force :  Air is another type of force that should be heavily considered when talking about forces. The resistance of air is a peculiar type that can be categorized as a frictional force. Since objects must move through air, the air provides resistance to the object’s motion. Often, this force is neglected, but it does have some effect on nearly all objects, particularly those with larger surface areas because they are usually more greatly affected by the forces of air. Consider skydivers, skiiers, bikers, etc.

• Tension Force : The type of force known as tension force is one that is usually transmitted through a lenthy skinny object like string, rope, cable, or wiring. When it is pulled tight from the opposite ends, this is known as tension force, and the force is applied along the length of the wire and each of the ends are pulled against equally.

• Spring Force : Spring force is a type of force that is exerted upon a compressed or a stretched spring against whatever type of object that is attached. The object then will compress or stretched by the force that will eventually return the object to equilibrium. There are many other types of forces but the above forces are some of the more fundamental and most observed and practically interacted forces in nature.

Force is nothing but the rate of change of momentum. According to Newton’s second law the rate of change of momentum is directly proportional to the amount of force applied and in the direction of force applied.

So the rate of change of momentum is nothing but change in velocity since mass of a body remains always constant unless the velocity reaches close to the velocity of light.

The main equation and the necessary information that is needed to calculate force and it’s relations includes

• Force = Mass * Acceleration , where Mass is the quantity of matter present in the object and Acceleration is the change in velocity due to the applied force in unit time.
• Unit of force is Kg/m/s^2 which other name is Newton. 1 Newton = 1 kg/m/s^2 or when a force of 1 Newton is applied on a body then it produces an acceleration of 1 m/sec^2.
• The acceleration due to gravity equals 9.8 m/s^2 so a force applied by the gravity on a body of mass 1 kg equals 9.8*1 kg/m/s^2 = 9.8 Newton.
• Force is a vector quantity because it depends on the direction in which it is applied upon.

In our conclusion, we believe it is fair to state that Force is a vital quantity in nature and in the absence of force, neither object would be still nor be thrust into motion. It is one of the fundamental units required to calculate and solve the laws of nature and it’s derivations.