Interactive Science exhibits, ideated and fabricated to inclucate and invigorate the young minds about Science !!
Principle of lever
Here, you can see three first order lever systems. The effort arm and load arm are of variable lengths for each of the three. Also, the fulcrum position is different. Try lifting loads at different effort arms.
What did you observe?
The effect of changing effort arm and load arm along with the fulcrum location can be experienced here.
The science behind it :
The mechanical advantage and the torque can be understood with these systems.