This museum is a ton of fun for kids. They have 4 floors, each focusing on different areas (electricity, building, kinetics, cars & motors, city planning, light, sound, etc). The kids were able to play with and manipulate almost every exhibit. The favorite was the kinetic room where the kids could use pulleys, ramps, wheels, conveyors and other machinery to move balls around a maze.
The only drawback to this museum is that all the display explanations are in Japanese, as is the movie. We were still able to enjoy the museum and stay all day, but we could have gotten more out of it had there been English descriptions. There is an English map with brief descriptions of each area are available.
There is a restaurant and a reasonably priced cafe onsite, but you can also bring your own lunch. There are several drink and ice cream vending machine throughout the building as well.

It was a long, hot walk from the station only to get there and find it was a students science project. We were put off because of that. We didn't go in or pay the 1000 yen charge, we were disappointed, although the outside of the building had very interesting design. No chairs to sit down inside.