THE FORCES IN NATURE

1. ELECTRICAL FORCE

1.1. The electric charge is symbolize with a letter Q and the unit in the international system is Coulomb (C)

1.1.1. Positives

1.1.2. Negatives

1.2. Appears between two bodies that possers electric charges.

1.2.1. Attractive

1.2.2. Revolting

1.2.3. Law's of Coulomb: F = K · Q1 · Q2 / d2

1.3. Electrostatic phenomenon in the atmosphere

1.3.1. Electric shock: ligthning

1.3.2. Ionization of air

2. MAGNETIC FORCE

2.1. Magnets

2.1.1. Electric field : E = F / Q

2.1.1.1. Lines of forces

2.2. Electric currents

2.2.1. Electromagnetism

2.2.1.1. Oersted experiment

2.2.1.2. Faraday's experiment

3. GRAVITY'S FORCE

3.1. Body weight / P = m · g

3.1.1. Gravity center

3.2. The universal gravity'slaw / F = G · m1 · m2 / d2

3.2.1. Movement of planets and satellite

3.2.2. Tide

4. FRICTION FORCE

4.1. It's against movement and appears in thecontact surface between two bodies. Fr = M · N

4.1.1. N = P = m · g