Questions tagged [moment-of-inertia]

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472 questions
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Moment of inertia “about ? axis”

I'm just trying to calculate how fast a 2D polygon should spin given x amount of energy. To do this, I figured I'd split my shape up into triangles, calculate the MoI for each around the polygons ...
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How to calculate torque required move this cart? (Description) [on hold]

Weight of cart is 2kg It has two wheels on back, each if 6cm It's front half is in contact with surface and has kinetic friction coefficient = 0.75 The cart has to move at constant velocity 1m/s ...
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How to find moment of inertia about centriodal axis in easiest way?

Actual question is Find the moment of Inertia of the cross-sectional area of an I section about its centroidal axis: My solution: Here $A_{1}, A_{2}$ and $A_{3}$ are the areas: Centriod at X axis;...
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What is the significance of having two formulas for area moment of inertia?

What is the significance of calculating area moment of inertia twice? I mean calculating area moment of inertia w.r.t axis and calculating same area moment of inertia w.r.t centroidal axis? Why not ...
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How can a flywheel make engine run smoothly?

In the video Moment of Inertia Demo, a man states that moment of inertia will be higher if the masses are away from the axis of rotation. The engine take more power to spin the flywheel, because of ...
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Moment of Inertia for Arbitrary Shape

Consider any arbitrary shape with arbitrary rotation axes, global and or local to the shape that are able to describe any orientation of the shape. The shape is also defined with an arbitrary density ...
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Increasing Mass VS Increasing Force when pushing a Box [closed]

If we assume g=10m/s^2 & negligible friction The force needed to accelerate that box by 5m/s^2 would be 500N. This is a very basic one. The confusion came when an force of 250N (the force a 25kg ...
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Force required for Angular Accleration

Suppose I have 4' x 4' piece of wood. Its mass is 150kg evenly distributed. I drill a hole right at a corner and place rod through the hole to create a rotational axis. I apply a tangental force at ...
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What's the seconde moment of a T beam with a heel?

the seconde moment of area of a rectangle is Iy = (bh^3)/12 b : base h : height What is the second moment of area of a T beam like this one ?