Gravitational force
I think most people might know about it. This force are exerted by the Earth. It pulls anything into the Earth core and creates a situation where the thrown object will return to the ground . It depends on mass and distance from the mass object. Actually, every single thing that have mass exert the gravitational force. Gravitational interaction exists among us but our mass are very low. That’s why we can’t feel it.
Friction force
This force exist when another force exist in the opposite direction of the force. It have made all forces in this world become non-ideal (different from calculation). However, we should thank god because we get lots of benefits due to its existence such as we don’t slip during walking. Natural friction force is created by the gravitational force. Let say, an eraser on a horizontal table will not move there are no external forces act on it. Each kind of surface have a different friction constant and this constant depends on forces act on it. Moreover, it can change mechanical energy into thermal energy.
Electric force
It exists in static and dynamic condition. Static electric force is called electrostatic and exist due to static positive and negative charge in a material. Electrostatic is massively created during the formation of thunder. Dynamic electric force occurs when there have electric potential. Conceptually, we can say that electric potential is voltage. Dynamic electric force can create current. Current is directly proportional to the voltage which mean when the current increase as the voltage increase and. Current can be defined as the flow rate of charge. The simplest theory that tells us about current is ohm’s law (V=IR) where V is voltage, I is current and R is resistance.
Magnetic force
This force exist when electric force exist. Therefore, we can control it by controlling the electric force. Magnetic force surround the electric force in anti clock wise direction. It have been applied in most electronic devices such as magnetic force are used in polarize plane in television.
