We have gathered below the main formulas of the Physics patent.

**I. MASS-WEIGHT:**

**I.1. The density :**

La **Volumic mass**, also called density density of mass, is **a physical quantity which characterizes the mass of this substance per unit volume**.

where r (density) is in kg / m^{3} or kg.m^{-3}; m (mass) is in kg or g; V (volume) is in m^{3} or cm^{3}

By extension :

*Examples *: *1 cone has a mass (m) of 250 g and a volume (V) of 20 cm ^{3}. Its density is m / V = 250/20 = 12,5 g.cm^{3}*

**I.2. The weight value:**

Le **weight** of a body (mass *m*) Is **the force of gravity exerted on it.**

where P (the weight) is in N (Newton); M (mass) is in kg or g; G (the intensity or force of gravity) is in N / kg or N. kg-1

By extension :

*Examples : A man has a mass of 70 kg. The intensity of gravity on Earth is 10 N.kg ^{-1} . The value of the weight of the man is 70 times 10 or 700 N*

Quote on physics:“Physics gives the how much, metaphysics the how.”

Buffon

**Continuation of the article, speed and kinetic energy, page 2**

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