Have you read These tutorials?Physics-BasicsPhysics forces-impulses-torque-and-joints
I ask this because there are many strange things in your capx. You use sine behaviour on immovable objects and you want them to respond to an object falling.
Furthermore the way you set up your joint doesn't work. It looks like you haven't read these tutorials and have no clue what you are doing.
Solving the problems in this capx would mean changing everything.
It would be better to make a new capx yourself.
I told my dentist I had trouble with my teeth and asked her to fix it without looking in my mouth..