About this video

• Video Title: 1.1 SI Units | General Physics
• Channel: Chad's Prep
• Speakers: Chad
• Duration: 00:12:24

Overview

This video introduces the fundamental SI (Systeme International) units used in general physics. It covers the seven base units, explains how derived units are formed, and discusses the importance of using SI units in calculations. The video also touches upon dimensional analysis as a tool for understanding relationships between units and briefly introduces derived units with special names like the Newton.

Key takeaways

• SI Units: The standard system of measurement used in physics, derived from French "Systeme International."
• Base Units: The seven fundamental units in the SI system: meter (length), kilogram (mass), second (time), mole (amount of substance), Kelvin (temperature), ampere (electric current), and candela (luminous intensity).
• Derived Units: Units formed by combining base units, such as square meters for area and cubic meters for volume.
• Unit Conversion: Emphasizes the necessity of converting all measurements to SI units before performing calculations in physics.
• Dimensional Analysis: Using units to understand the relationship between physical quantities and to help derive or check equations, such as velocity being length over time.
• Named Derived Units: Some derived units have special names (e.g., Newton for force), which are combinations of base units (e.g., a Newton is kg·m/s²).

The seven base SI units and the quantities they measure are:

• Meter (m): Length
• Kilogram (kg): Mass
• Second (s): Time
• Mole (mol): Amount of substance
• Kelvin (K): Temperature
• Ampere (A): Electric current
• Candela (cd): Luminous intensity