Mass in mechanical systems

The foree to aeeelerate a body is the produet of its mass and aeeeleration (Newton s seeond law). 

In equation (2.17) / is the moment of inertia about the rotational axis. 

When analysing meehanieal systems, it is usual to identify all external forees by the use of a Free-body diagram , and then apply Newton s seeond law of motion in the form  

Henee a spring-mass-damper system is a seeond-order system. If the mass is zero then 

Thus if the mass is negleeted, the system beeomes a first-order system. 

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