I don’t even know really what intertia means let alone moment of it??
Plz help
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You’ve probably heard Newton’s first law of motion, that absent any outside force, an object in motion tends to stay in motion and an object at rest tends to stay at rest. This is the principle of inertia. It means that a force is required to change an object’s velocity.
Inertia is affected by the object’s mass. The classic formula F = ma, force equals mass times acceleration, can be written as a = F/m, acceleration equals force divided by mass. So the more mass something has, the less it will accelerate when a force is applied.
A “moment” in physics means the product of a physical quantity and a distance, but usually when we use the word “moment” we are specifically talking about torque: a product of force and distance. Torque (or moment) is the rotational equivalent of force; you apply it to cause an object to rotate; to change rotational velocity.
The moment of inertia is the rotational equivalent to mass. It tells you how much the object will resist rotational acceleration (usually called angular acceleration) for a given torque. So we can take the a = F/m formula and come up with its rotational analog. α is angular acceleration, 𝜏 is torque, and I is moment of inertia. So the formula becomes α = 𝜏/I. The angular acceleration equals torque divided by moment of inertia.
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