<![CDATA[The progress of physics is based on facts and experimental data. Therefore, it is very important to prove or verify some theories experimentally. One of fundamental laws of physics is momentum conservation law. It has been used extensively in many mechanical problems involving collisions. However, the use of this law is usually taken for granted and rarely been demonstrated experimentally due to technical difficulties in determining the instantaneous velocities of the objects before and after the collision takes place. These difficulties can be solved by using Linear Air Track to prove the conservation law of momentum by colliding two vehicles on the track, because Linear Air Track can provide linear and stable motion with negligible friction force between vehicles and its track. By using photographic technique, the image can be quantified and analyzed to obtain the instantaneous velocities the object before and after collision. As a temporary hypothesis Linear Air Track can be use to verify the linear momentum conservation law on any collision between two objects. Due to considerably high degree of measurement uncertainties involved in the experiment, the hypothesis will be accepted if the comparative ration between the final and initial total momentum of the system is up or equal to 90%. The result from this experiment shows that the percentages of accuracy are up to 90%. Then, we may conclude that Linear Air Track can be used to verify the linear momentum conservation law on any collision between two objects.]]>
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