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Inertia is an expression for the tendency of all bodies to resist motion, or to continue in motion if already moving. If a body undergoes linear motion (translation), inertia corresponds to the mass of the body. In order to express inertia of a rotating body, the so-called rotational inertia is defined as suitable physical quantity. A bowling ball has more inertia than a tennis ball, due to its higher mass.
When two frames of reference are moving relative to each other at constant velocity, they are said to be inertial reference frames. The observers from two such inertial frames measure, in general, different velocities of a moving particle. On the other hand, they measure the same acceleration for the particle. The laws of physics must have the same form in all inertial reference frames (the principle of invariance).
Generalic, Eni. "Inercija." Croatian-English Chemistry Dictionary & Glossary. 29 June 2022. KTF-Split. {Date of access}. <https://glossary.periodni.com>.
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