Category

Sendai No.3 Senior High School(2002)

Summary

Goal

• Measure each crater's diameter.
• Investigate the structures of craters.

Experimental Method

A.

1. Dry sand taken in Nobiru seashore and sift it to make its diameter under 0.5mm.
2. Attach a plastic sheet onto the inside of a box and pave the sand.
3. Drop an iron sphere onto the target from different heights and measure the diameter.

B.

1. Apply colour to the sand using the spray paint. (8 different colours)
2. Add layers of coloured sand onto the uncoloured sand. Each layer should be 4mm thick.
3. Drop the iron sphere onto the target. Then, pour heated agar solution onto the target. (Allow to dry for 3 days.)
4. Cut the crater and observe how the sand layering has been changed by the impact.

Experimental Results

Discussion

A.

1. As the impact energy increases, then so does crater diameter.(from the graph)
2. Larger mass, size and higher initial rate are necessary to make larger craters.

B

The second layer from the surface is spread over a large area. The first layer may be spread over a greater area. Layers deeper than the fifth layer is not found in the surface, that means the ejecta is from the area shallower than 2.0cm in depth.