Mack Mack 3 3 gold badges 17 17 silver badges 29 29 bronze badges. You'll want to look into the general use of the term "moment" and understand that "moment of inertia" is short for "the first moment of inertia". Active Oldest Votes. Claudius Claudius 2, 12 12 silver badges 24 24 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Air 3, 4 4 gold badges 21 21 silver badges 44 44 bronze badges. This includes motors as well as generators.
Correct that the majority of inertia comes from rotating machinery. Old coal-fired generators have very high inertia. New aeroderivative gas turbines i. Active Oldest Votes. Some concluding thoughts: The pessimist might argue that system reliability is doomed due to the decrease in overall system inertia and that we'll see more brownouts and blackouts as part of upgrading the overall power grid.
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Email Required, but never shown. The Overflow Blog. He concluded that a ball cycling up and down these planes would continue to rise to the same height forever if friction were not a factor. Newton used this result to formulate his First Law, which states:. Every object continues in its state of rest or motion in a straight line unless acted upon by an external force.
According to Newton's Second Law, the force F required to change the state of motion of an object is the product of the object's mass m and the acceleration produced by the force a :.
To understand how mass is related to inertia, consider a constant force F c acting on two different bodies. The first body has mass m 1 and the second body has mass m 2. The Earth experiences three dominant periodic motions of much longer periods that are not readily perceptible. Each of these give insight into the interior structure of the Earth or has a direct effect on the Earth's climate because they change the basic geometry of the Earth in its orientation with respect to the Sun.
The rotational axis of the Earth is tilted with respect to the normal to the plane of the ecliptic, presently at an angle of about That is, it doesn't stand up straight but leans over a bit.
Because of the oblate shape of the Earth and the tilt, the Sun exerts a gravitational pull that differs in force at the two poles. The effect is to attempt to set the Earth up straight - i.
This would be a least energy configuration. This "righting force" has the effect of causing the rotational axis to execute a circular, wobbling motion, like a spinning top.
To understand the motion imagine a rod through the Earth's axis of rotation. Hold the rod at its middle point the center of the Earth and make one end move around in a circle. Waffle's Crazy Peanut Waffle's Crazy Peanut 8, 6 6 gold badges 33 33 silver badges 69 69 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name.
Email Required, but never shown. Featured on Meta.Dec 16, · Founded in , The Inertia is the definitive voice of surf and outdoors. We approach the natural world and its devoted culture with curiosity, optimism, and respect.