3 games from the Matter Never Disappears simulation: Predict the Mass, Where Did It Go?, Changes Mass?. Each one has a Warm up, Explorer and Expert level.
What will the scale show? Read the question, think, then tap your answer. You have 2 tries for each one.
Match the change to where the “missing” mass went. Drag each card to its partner – or tap a card, then tap its partner. You have 2 tries for each one.
In an OPEN container, does the scale reading change? Drag each card into the right group – or tap a group. You have 2 tries for each one.