An elevator makes an interesting science project. You can set up a series of pulleys to have a model elevator running up and down a model building. You can even populate the building and elevator with dolls that can take a ride in the demonstration of just how the model elevator works.

What are you going to need? A cardboard shoebox to make the elevator. A larger cardboard box to fill in for the building. You can add some partitions in the larger box to make separate floors for the elevator to move to and from. You will need thread or some strong string that can be used to haul the model elevator up and down the model building.

To ensure that the tread moves smoothly you will need to use empty thread reels or spindles over which the thread or string can move and be wrapped properly. That way you will ensure that it does not get tangled up as you pull it up and down. You will also need to mark the thread at specific points so that you can run the elevator to specific floors in the mock building.

Once the basic mechanics of the elevator are sorted out you can now beautify the building and the elevator. Use poster paints to brighten up the science fair project. You can add trimming to the separate floors  making rooms with furniture or corridors with doors. Use your imagination and have fun.