🔀 Which one changes?

The answers, and why

1. In the "Does a steeper ramp make a toy car go farther?" test, which one do YOU change? Ramp height. Yes! Ramp height is what you change: 1 book high, 2 books high, 3 books high. It's called the independent variable.

2. In the "Does a pointed nose make a straw rocket fly farther?" test, which one do YOU change? Nose shape. Yes! Nose shape is what you change: Flat, folded shut, Short pointed cone, Long pointed cone. It's called the independent variable.

3. In the "Which padding keeps a dropped egg from cracking?" test, which one do YOU change? Padding. Yes! Padding is what you change: Crumpled paper, Cotton balls, Bubble wrap. It's called the independent variable.

4. In the "What keeps a cut apple from going brown?" test, which one do YOU change? Dipped in. Yes! Dipped in is what you change: Nothing, Plain water, Salt water, Lemon juice. It's called the independent variable.

5. In the "Which bread turns the brownest in the toaster?" test, which one do YOU change? Bread. Yes! Bread is what you change: White, Whole wheat, A sweet bread, like brioche. It's called the independent variable.

6. In the "Does planting a seed deeper make it slower to come up?" test, which one do YOU change? Planting depth. Yes! Planting depth is what you change: 1 cm deep, 3 cm deep, 6 cm deep. It's called the independent variable.

7. In the "Which kind of ball bounces highest?" test, which one do YOU change? Kind of ball. Yes! Kind of ball is what you change: Tennis ball, Rubber ball, Foam ball, Ping-pong ball. It's called the independent variable.

8. In the "Does a bigger disc make a top spin longer?" test, which one do YOU change? Disc size. Yes! Disc size is what you change: Small (a bottle cap), Medium (a cup bottom), Big (a bowl bottom). It's called the independent variable.