?? English instruction:
Sit on the chair and turn.
Spread your arms or pull them in close to your body.
To amplify the effect, use the weights.
• What happens when you pull your arms in close while the chair is rotating?
• What happens when you spread them?
• Ask a partner to sit in the chair and hold the weights.
Set the chair in motion. Repeat the experiment, this time your partner spreads his arms.