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Module 3: Waves and Thermodynamics

Describing Motion Using Scalar and Vector Quantities

What is rectilinear and uniformly accelerated motion?

In this post, we are describing uniform straight-line (rectilinear) motion and uniformly accelerated motion through qualitative descriptions and the use of scalar and vector quantities, as a part of the Prelim Physics course under the module Kinematics and sub-part Motion in a Straight Line. Rectilinear motion is an object’s displacement, velocity, and acceleration along a straight line, while uniformly accelerated motion is when the acceleration of an object is constant, for example, dropping a tennis ball from a height and watching it accelerate downwards due to gravity.

The following video covers the definitions of uniform and non-uniform motion, to allow for a more clear understanding of what motion is.


What are vectors and scalars?

A scalar quantity is a quantity that does not depend on direction such as speed, while a vector quantity has a magnitude and a direction. In the following two videos, it is made more clear by introducing the properties of each and covering countless examples.

Part 1: Introduction to vectors and scalars


Part 2: Examples of vectors and scalars