As written, this activity is useful for upper primary/lower secondary students. Modify it for younger students by removing the timing aspect and simply observing the differences from the starting positions.
This activity includes both hands-on and measurement aspects. It's useful for secondary school students.
This balance is way more sophisticated than the balances envisioned by Galileo - but its fun to watch. Encourage students to sketch a design of a balance using materials around the house. Challenge them to build the model and then video the outcome. Not every one of Galileo's ideas worked - but he gave it a shot!
Good background reading for catapults.
This is useful background knowledge for educators.
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