n DT, we have been learning about levers and linkages. The lever is the long bar and the linkage is where the levers can pivot. We learnt that oscillating movement is one that moves backwards and forwards in an arc; rotating movement is in a circle; linear movement in a straight line. After making several moving pictures, we had to work as a class to design and make an extendable barrier for the corridor. It was tricky and we had to persevere, as well as use great team work.