Physical Quantities and Basic Formulas

This page introduces fundamental physical quantities and their mathematical relationships in physics and chemistry. The content focuses on density, weight, energy, and electrical concepts.

Definition: Density (masse volumique) is defined as mass per unit volume, expressed in kg/m³.

Vocabulary:

• Masse (m): Mass measured in kilograms (kg)
• Volume (V): Space occupied measured in cubic meters (m³)
• Vitesse (v): Velocity measured in meters per second (m/s)

Example: Weight calculation using P = m × g, where g is gravitational field strength (N/kg)

Highlight: Power (P) can be calculated in two ways: through energy over time (P = E/t) or through electrical quantities (P = U × I)

Electrical Relationships and Energy Formulas

This page delves deeper into electrical relationships and kinetic energy calculations, concluding with important unit reminders.

Definition: Kinetic energy (Ec) represents the energy possessed by an object due to its motion, calculated using Ec = ½ × m × v²

Vocabulary:

• Tension (U): Voltage measured in volts (V)
• Résistance (R): Electrical resistance measured in ohms (Ω)
• Intensité (I): Current measured in amperes (A)

Example: Ohm's law demonstrates the relationship between voltage, current, and resistance through U = R × I

Highlight: The document concludes with essential unit reminders:

• Newton per kilogram (N/kg) for gravitational field strength
• Joule (J) for energy
• Watt (W) for power
• Volt (V) for electrical potential difference
• Ampere (A) for current
• Ohm (Ω) for resistance