how to make an object rotate with another objects

Hi,

i have two objects and both are pinned.one object is like a pin and another object is a wood.once a new object is falling down on the wood it should detect the mass of the falling object and should rotate based on that mass.

i tried that by giving angular velocity based on the falling object mass as like"object.physics.mass".but am clear that it will rotate continously.

what i actually want is while falling that object it should go up and down based on the mass.

please help me to find it

Thanks in advance

Could you post a diagram or something? I don't know what you mean.

hi sqiddster,

              Here is what which i have done. when the object falls on the particular object it should rotate based on the mass.

dropbox.com/s/ge3rpz878c79nl8/test3.capx

Could you please help in this.

Thanks in advance