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h1. MIT 8.01 Lesson 3:  Motion with Constant Velocity and Zero Net Force

h4. Lesson Summary

{excerpt:hidden=true}We introduce a simple [model] based on Newton's revolutionary insight - that the natural state of motion of an isolated body is motion with constant velocity.{excerpt}We now explore our first [model] - motion with constant velocity.  According to Newton, this is the natural state of motion.  If the net [external|external force] [force] acting on a body is zero, the body will move with constant [velocity] (with respect to an inertial coordinate system).

h4. Learning Objectives

After completing this Lesson, students should be able to:

* understand and use the [One-Dimensional Motion with Constant Velocity|1-D Motion (Constant Velocity)] model template from the [Model Hierarchy].  
* accomplish the Learning Objectives listed in that [template|1-D Motion (Constant Velocity)].

{include:Motion with Constant Velocity (Systems)}
{include:Motion with Constant Velocity (Interactions)}
{include:Motion with Constant Velocity (Laws of Change)}
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{include:Motion with Constant Velocity (Multi-Stage)}

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Mathematically, motion with constant velocity is quite straightforward: the velocity is constant and the position changes linearly with time.  The hard part sometimes is to determine why the net force is zero when some forces are more obvious than others.
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