This pencil has a net torque of zero because it is able to balance on the ruler. This means that the counterclockwise torque is equal to the clockwise torque. The weight of the eraser and the metal on one side of the pencil requires a shorter radius to match the torque of the other side because T=Fr. The larger the force is on one side the shorter the radius needs to be to equal the torque on the other side. Physics is fun!
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