What factors affect an object\'s resistance to rotational motion? We are going t

Question

What factors affect an object's resistance to rotational motion? We are going to start out this lab by investigating how to calculate the moment of inertia. Let's start out by considering the barbell shown in Figure P-1. Figure P-1: Shown here are two barbells. They have the same maw but have different moments of inertia. Koch is intended to be held in the center and twisted. The bars show n Figure P-1 have two different configurations. Use the in information given in the moment of inertia facts to determine an equation for the moment of inertia for each of the two configurations Assuming that a person's hand is placed in the center twists bar. Masses Close: Masses Far: Which one would you expect to have a larger moment of inertia

Explanation / Answer

a)

the moment of inertia of a rod about centre is

I = 1/12 * M * L^2

let the two masses are at a distance of R from the centre then

I = 2 * M * R^2

the moment of inertia of the masses close is

I = 1/12 * M * L^2 + ( 2 * M * R^2)

b)

I = 1/12 * M * L^2 + ( 2 * M * (L/2)^2)

3)

the momewnt of inertia is larger in the case of masses far from the centre

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