Introduction to Kinematics
Kinematics helps us describe motion using both scalar quantities (which have only magnitude) and vector quantities (which have both magnitude and direction). This distinction is crucial for understanding how objects move through space.
The basic quantities in kinematics start with position (where something is located, measured in meters) and time (when something happens, measured in seconds). From these, we derive distance (the length of the path traveled) and displacement (the straight-line vector from start to finish, calculated as Δx = xₑ - xᵢ).
When describing how fast things move, we use speed (a scalar quantity measured in meters per second) and velocity (a vector quantity also in meters per second). Finally, acceleration measures how quickly velocity changes, expressed in meters per second squared .
💡 Remember this key difference: Distance tells you how far something traveled along its path, while displacement only cares about the start and end points - like a crow flying directly between two locations!
