Inertia (noun)

1. A tendency to do nothing or to remain unchanged.
2. The property of a body that causes it to remain at rest or in uniform motion in the same straight line unless acted upon by a force.

Origin:

Late 16th century: from latin inertia, from in- 'not' + ars, art- 'being active'.

Examples:

1. The inertia of the old system made it difficult to introduce change.
2. The balloon's ascent was slowed by the drag of air, but its inertia kept it moving upward.
3. The company's inertia was hindering their progress.
4. The heavy weight of the train made it difficult to overcome its inertia.
5. The rocket's inertia kept it moving in the same direction even after the engines had shut down.