The forces in the nature

1. Magnetic force

1.1. In magnet

1.1.1. Magnetic field

1.1.1.1. Force line

1.2. In electric current

1.2.1. electromagnetism

1.2.1.1. Oersted experiment

1.2.1.2. Faraday experiment

1.2.1.2.1. Electromagnetic induction

2. Electric force

2.1. The electric charge is symbolize with the letter Q and their unit in the SI is the Coulomb (C)

2.1.1. Positive

2.1.2. Negative

2.2. it appear between the bodies that have electric charges

2.2.1. Attractives

2.2.2. Repulsives

2.2.3. Their intensity is calculated with

2.2.3.1. The Law of Coulomb

2.2.3.2. F = K · Q1 · Q2 / d2

2.3. Electric field (E)

2.3.1. E = F / Q

2.3.1.1. Force line

2.4. Electrostatic phenomenons in the atmosphere

2.4.1. Electric download: lightning

2.4.1.1. Preventative measures of the effects

2.4.2. ionization of the air

3. Gravitatory force

3.1. Weight of bodies

3.1.1. W = m · g

3.1.1.1. Gravity middle

3.2. The law of universal gravitation

3.2.1. F = G · m1 · m2 / d2

3.2.1.1. movement of planets and satellites

3.2.1.2. tides

4. Force of friction

4.1. It's oppose to the moevement and appear in the surface of contact between two bodies

4.1.1. Fr = u · N

4.1.1.1. If the movement is in the horizontal shot

4.1.1.1.1. N = P = m · g