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Module 3: Waves and Thermodynamics

Describing Static and Dynamic Interactions (Newton’s Laws of Motion)

What are Newton’s Laws of Motion?

In this post, we use Newton’s Laws of Motion, to describe static and dynamic interactions between two or more objects and the changes that result from a contact force or a force mediated by fields, as a part of the Prelim Physics course under the module Dynamics and sub-part Forces. Newton’s Laws of Motion are:

  1. Inertia: An object will remain at rest or in uniform motion in a straight line unless compelled to change its state by the action of an external force.
  2. F = ma : The velocity of an object changes when it is subjected to an external force. For an object with a constant mass m , the second law states that the force F is the product of an object’s mass and its acceleration a .
  3. For every action (force) in nature, there is an equal and opposite reaction.


The following two videos go further in-depth about what Newton’s Laws of Motion are, and why they are significant in describing static and dynamic interactions.

Part 1: Crash Course Newton’s Laws


Part 2: Static and dynamic interactions