Definition of Force :
A push or pull on an object which causes motion in body is called as Force. The SI unit of Force is called as Newton. It is a vector quantity.
Types of Forces :
1. Contact force
2. Non Contact force
- CONTACT FORCE
It is force that act between the two bodies when there is a direct contact between them. Contact force is further of four types : Friction Force, Normal Reaction, Tension and Spring Force.
1). Friction Force - Frictional force is the force produced when two surfaces slide against and touch each other. The surface texture and amount of force needing them together have the biggest an impact on these forces. The amount of frictional force is influenced by the object position and angle.
2). Normal Reaction - The force that any surface applies to another object is known as the normal force. The net force applied on the object is equal to zero if it is at rest. It is a truth that the upward force, or normal force, must be equal to the descending force, or weight.
3). Tension - Tension force is a force created when a rope, string, or cable is stretched as a result of an external force. Along the length of the rope or cable, tension is exerted in the opposite direction as the force acting on it. Stress, tensity, and tautness are other terms that may be used to describe tension.
4). Spring Force - Since springs are a common tool, their inertia is generally disregarded due to their insignificant bulk. It is a rather careless action for a spring to undergo displacement when stressed or compression when compacted. After then, it reaches its equilibrium position. Therefore, a spring applies a force that is equal to and opposite to the force that compresses or stretches a body.
- NON CONTACT FORCES
Non-contact forces are those that operate through voids without coming into physical touch with the body. There are three types of Non Contact Forces : Gravitational Force, Electrostatic Force and Magnetic Force.
1). Gravitational Force - Any two bodies will be attracted to one another by the force of gravitation, also known as gravity. There is an attraction between every thing in the cosmos, but most of the time it is too faint to be noticed due to the extreme distance between the objects. Additionally, although though gravity field of influence is limitless, its strength diminishes with distance.
2). Electrostatic Force - The attraction or repulsion between two charged particles is called the electrostatic force. It is also known as Coulomb interaction or Coulomb force. For instance, stability of atom is due to the electrostatic force that exists between its protons and electrons.
3). Electromagnetic force - Electromagnetic force is a result of charge motion, which also produces magnetic force. We know that a moving charge creates a magnetic field around itself. It is possible to think of the magnetic force as a result of magnetic fields interacting with one another.