Physics and Measurement Study Guide

Classical Physics

The era of physics from Copernicus to the end of the 19th century, encompassing mechanics, thermodynamics, electromagnetism, and optics.

Modern Physics

The study of physics from the 20th century to the present, including relativity, cosmology, quantum mechanics, and particle physics.

Dimensional Consistency

The requirement that physical laws must have quantities on both sides of an equation that share the same mechanical dimensions.

Length

A fundamental mechanical dimension defined as the distance between two points in space, symbolized as $L$.

Mass

A fundamental mechanical dimension that measures the quantity of matter in an object, symbolized as $M$.

Time

The measure of change representing the continuous progression of events, symbolized as $T$.

Density

Defined as mass divided by volume, with units represented as $\text{Density} = \frac{M}{L^3}$.

Units of Measurement

Standardized quantities that allow the communication of experimental results, such as meters for length, kilograms for mass, and seconds for time.

Unit Conversion

The process of changing the numerical value of a measurement from one unit system to another using a conversion factor that equals '1'.

Acceleration

Defined as the change in speed over time, represented as $\text{Acceleration} = \frac{L}{T^2}$.

Gravitational Constant

A constant in Newton's law of gravity that describes the acceleration due to gravity between two masses, affecting the mechanics dimension of the constant.