Farrell wrote: > Sarah, Mark and Jim are headed in the right direction. > > An object's inertia is directly related to its mass and velocity. The more > mass it has and the faster it is traveling, the more inertia it has. A > bullet, travelling at some very high velocity, could have a similar amount > of inertia as a very slowly moving locomotive. > > Basically, a good way to think of inertia is, the harder it is to stop > something, the more inertia it has. > No that's not right, velocity does not change inertia. The mass is the inertia if the body is moving in a straight line. What you are talking about it momentum, which is mass times velocity. It may as well be inertia times velocity. When objects are moving in a straight line their mass is their inertia. When they are moving in a circle around a point the inertia is increased due to the constant acceleration toward the center which is always R^2. John Hartman RPT John Hartman Pianos [link redacted at request of site owner - Jul 25, 2015] Rebuilding Steinway and Mason & Hamlin Grand Pianos Since 1979 Piano Technicians Journal Journal Illustrator/Contributing Editor [link redacted at request of site owner - Jul 25, 2015]
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