I would choose an activity on shadows.
Ideally I would start this lesson outdoors to spark inquiry. Ask children to stand in different positions and to ask what they notice around them. Is there anything happening when you move. What do you see. Then pair the children up to further encourage discussion. Have the children walk from one place to another. Ask the, what they observe when doing this. Children could record there observations in diagram/sentences based on ability.
We would return indoors and discuss our observations and thought shower all of our findings on an anchor chart.
I really enjoyed the 3D activity and torch. There is so much scope with that so I’d like to try that out. I’d like to encourage a collaborative approach to this so as to optimise observational talk and trialling and testing.
At the end of the lesson I would address any misconceptions that have arisen. After that each group could share their findings and answer questions from their peers.