No, you can't just add them. The calculation is usually more involved.
Don't know what the textbooks might tell you but I think this list of moments of inertia is rather comprehensive: rectangle circle cylinder hollow cylinder i beam triangle rod square disk area mass sphere hoop rotational t section ring shaft semi circle But these are moments of inertia. Not clear what you mean by moment of "force." Of course there is a force associated with moments of inertia. And that's the force F that is turning the object that has the inertia. In general that force is F = Ia where I is the moment of inertia and a is angular acceleration of the object.
In physics, the perpendicular axis theorem (or plane figure theorem) can be used to determine the moment of inertia of a rigid object that lies entirely within a plane, about an axis perpendicular to the plane, given the moments of inertia of the object about two perpendicular axes lying within the plane. The axes must all pass through a single point in the plane.Define perpendicular axes , , and (which meet at origin ) so that the body lies in the plane, and the axis is perpendicular to the plane of the body. Let Ix, Iy and Iz be moments of inertia about axis x, y, z respectively, the perpendicular axis theorem states that[1]This rule can be applied with the parallel axis theorem and the stretch rule to find moments of inertia for a variety of shapes.If a planar object (or prism, by the stretch rule) has rotational symmetry such that and are equal, then the perpendicular axes theorem provides the useful relationship:DerivationWorking in Cartesian co-ordinates, the moment of inertia of the planar body about the axis is given by[2]: On the plane, , so these two terms are the moments of inertia about the and axes respectively, giving the perpendicular axis theorem.
Inertia
The answer will depend on whether the axis isthrough the centre of the disk and perpendicular to its plane,a diameter of the disk, orsome other axis.Unless that information is provided, the answer is meaningless.
Inertia is associated with mass
yes
Don't know what the textbooks might tell you but I think this list of moments of inertia is rather comprehensive: rectangle circle cylinder hollow cylinder i beam triangle rod square disk area mass sphere hoop rotational t section ring shaft semi circle But these are moments of inertia. Not clear what you mean by moment of "force." Of course there is a force associated with moments of inertia. And that's the force F that is turning the object that has the inertia. In general that force is F = Ia where I is the moment of inertia and a is angular acceleration of the object.
P. J. Reese has written: 'Moments of inertia'
The moments of inertia are calculated through integration. You divide the object into small pieces, and calculate mr2 (mass times the square of the distance from the center) for each piece.
perry como
In physics, the perpendicular axis theorem (or plane figure theorem) can be used to determine the moment of inertia of a rigid object that lies entirely within a plane, about an axis perpendicular to the plane, given the moments of inertia of the object about two perpendicular axes lying within the plane. The axes must all pass through a single point in the plane.Define perpendicular axes , , and (which meet at origin ) so that the body lies in the plane, and the axis is perpendicular to the plane of the body. Let Ix, Iy and Iz be moments of inertia about axis x, y, z respectively, the perpendicular axis theorem states that[1]This rule can be applied with the parallel axis theorem and the stretch rule to find moments of inertia for a variety of shapes.If a planar object (or prism, by the stretch rule) has rotational symmetry such that and are equal, then the perpendicular axes theorem provides the useful relationship:DerivationWorking in Cartesian co-ordinates, the moment of inertia of the planar body about the axis is given by[2]: On the plane, , so these two terms are the moments of inertia about the and axes respectively, giving the perpendicular axis theorem.
Malverd A. Howe has written: 'Masonry' -- subject(s): Masonry 'The theory of the continuous girder' -- subject(s): Girders 'Influence diagrams for the determination of maximum moments in trusses and beams' -- subject(s): Girders, Moments of inertia, Trusses
An object rotating about its long axis will have a different moment of inertia than when it is rotating about its short axis. A solid disk will have a different moment than a washer, and there are formulas derived for calculating the moments of many common shapes.
Structural steel members are the I-beams which consist second moments of area (moment of inertia of plane area), it allow them to be very stiff in respect to their cross-sectional area.
Inertia. All mass, all of it, is affected by its own inertia. Because mass has inertia it takes force applied over time to change the velocity of that mass. Which is to say to change its speed, its direction, or both. And that has practical implications. If you want your car to start moving you need to add force to pushing it to overcome the car's inertia and get it accelerating for example. Or if you are going down one street and want to turn left onto another street you must add force to make that turn because, otherwise, the cor would go straight because of its inertia.
In physics, the perpendicular axis theorem (or plane figure theorem) can be used to determine the moment of inertia of a rigid object that lies entirely within a plane, about an axis perpendicular to the plane, given the moments of inertia of the object about two perpendicular axes lying within the plane. The axes must all pass through a single point in the plane.Define perpendicular axes , , and (which meet at origin ) so that the body lies in the plane, and the axis is perpendicular to the plane of the body. Let Ix, Iy and Iz be moments of inertia about axis x, y, z respectively, the perpendicular axis theorem states that[1]This rule can be applied with the parallel axis theorem and the stretch rule to find moments of inertia for a variety of shapes.If a planar object (or prism, by the stretch rule) has rotational symmetry such that and are equal, then the perpendicular axes theorem provides the useful relationship:
There are actually 3 kinds of inertia. They are as follows : 1. Inertia of Rest 2. Inertia of Motion 3. Inertia of Direction But nowadays people consider that there are 2 kinds of inertia , inertia of rest and inertia of motion.