P6M made string telephones and carried out a range of tests to find out which resources carried the sound most effectively.

We talked about investigations in Science, how they are carried out, the importance of a fair test and variables.

The things that the pupils changed/tested were:

• The materials that the cups were made of (plastic/paper),
• The length of the string,
• The type of string,
• How taut the string was,
• What if the string went around a corner?
• What if the string had a knot in it?