I don’t even know really what intertia means let alone moment of it??
Plz help
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Inertia is a measure of how hard it is to get something to change its velocity (that is, to speed up, slow down, or change direction). It’s essentially equivalent to mass – massive objects take more force to speed up, slow down, or to get them to change direction when they’re moving.
Moment of inertia is the same idea, but for rotation. Objects with a high moment of inertia take a lot of torque (the rotational equivalent of force) to speed up their rotation, slow down their rotation, or change the direction they’re rotating. Moment of inertia depends not only on how massive an object is, it also depends on how far away each part of the object is from the axis of rotation. More spread out mass means a higher moment of inertia, and more concentrated mass means a lower moment of inertia.
Moment of inertia is related to angular momentum. The angular momentum of an object is equal to its moment of inertia, multiplied by its angular velocity (like how linear momentum is equal an objects mass multiplied by its velocity). Angular momentum is conserved, which explains some things about the behaviour of spinning objects. The classical example here is an ice skater spinning on the spot, and then drawing their arms in to spin faster. They don’t change their mass, but by moving their arms inwards, they move their mass closer to the axis of rotation, which decreases their moment of inertia. Since angular momentum is conserved, their angular velocity has to increase to compensate, and they spin faster.
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