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DT making a shaduf

For our Big Project in the Spring term, we will be designing and making a Shaduf that can be used in 3rd World countries to move water from one place to another.  So, we were given a challenge to have a go at making a prototype using 4 straws, some string, blu tac, a polystyrene cup and a paper clip.  We had to ensure that our shaduf had a lever, pivot, container, supports, counterweight and some rope.