Page 1: Measurement Uncertainty and Motion Basics
This page introduces fundamental concepts of measurement uncertainty and basic motion description. The content explores how to measure physical quantities and understand motion relativity.
Definition: Instrument resolution is defined as the smallest change in value that can be detected by a measuring instrument.
Highlight: Every measurement contains inherent uncertainty - it's impossible to measure a physical quantity with absolute precision.
Example: For single measurements, results are expressed as x ± Δx, such as 25.6±0.1cm.
Vocabulary: Relative uncertainty refers to the ratio between measurement uncertainty and the measured value, typically expressed as a percentage.
Highlight: Motion is always relative, and the path of motion trajectory is the line traced by a moving body.
The page also distinguishes between average and instantaneous velocity, explaining that measurements over longer time periods yield average velocity, while shorter intervals provide instantaneous velocity.
Definition: Position is defined as the point in space where a moving body is located at a specific moment.
Definition: Displacement is the vector connecting the initial and final positions of a body.