The simplest form of the particle in a box model considers a one-dimensional system. Here, the particle may only move backwards and forwards along a straight line with impenetrable barriers at either end. The walls of a one-dimensional box may be visualised as regions of space with an infinitely large potential energy. Straight-line motion: connecting position, velocity, and acceleration. Given the velocity-time graph of a linear motion, we can interpret whether the moving object moves forward or backward (or right - [Instructor] An object is moving along a line. The following graph gives the object's velocity over time.
A large mass, which moves without rotation (e.g. a car moving along a straight line) 2. A single particle which is attached to a rigid frame with negligible mass (e.g. a person on a bicycle) In these cases it may be necessary to consider the moments acting on the mass (or frame) in order to calculate unknown reaction forces. 1.