Inertia:  Inertia is the resistance of any physical object to a change in its state of motion. It is represented numerically by an object's mass. The principle of inertia is one of the fundamental principles of classical physics which are used to describe the motion of matter and how it is affected by applied forces. Inertia comes from the Latin word, "iners", meaning idle, or lazy. Sir Isaac Newton defined inertia in Definition 3 of his PhilosophiƦ Naturalis Principia Mathematica, which states:

The vis insita, or innate force of matter is a power of resisting, by which every body, as much as in it lies, endeavors to preserve in its present state, whether it be of rest, or of moving uniformly forward in a straight line.

In common usage, however, people may also use the term "inertia" to refer to an object's "amount of resistance to change in velocity" (which is quantified by its mass), or sometimes to its momentum, depending on the context (e.g. "this object has a lot of inertia"). The term "inertia" is more properly understood as shorthand for "the principle of inertia" as described by Newton in his First Law of Motion. This law, expressed simply, says that an object that is not subject to any net external force moves at a constant velocity. In even simpler terms, inertia means that an object will always continue moving at its current speed and in its current direction until some force causes its speed or direction to change. This would include an object that is not in motion (velocity = zero), which will remain at rest until some force causes it to move.

Definiation provided by Wikipedia 


Mass:  Mass commonly refers to any of three properties of matter, which have been shown experimentally to be equivalent: inertial massactive gravitational mass and passive gravitational mass. In everyday usage, mass is often taken to mean weight, but in scientific use, they refer to different properties.

The inertial mass of an object determines its acceleration in the presence of an applied force. According to Isaac Newton's second law of motion, if a body of mass m is subjected to a force F, its acceleration a is given by F/m.

Definiation provided by Wikipedia 

 Portfolio Check List

How does it work, accelerometer

Gallery Project

In your own words describe the difference between Inertial mass, Active gravitational mass, and Passive gravitational mass . 

Your project needs to be posted on the gwhs physics ning website. 

your project has to be either

1. A series of pictures if captions explaining the differences 

2. An audio recording 

3. A video recording, the video recording cannot contain the images of students under the age of 18 years old. 

4. Using a web based tool to create a presentation.  Some of the tools you should consider for this assignment include 





if find any other tools that should be included on this please let me know and add them.