Features: 1. Happy and easy to learn 2. Exercise your children practical ability 3. Train your children observation capability, thinking and analytical skills Learning Points: Fixed pulley, movable pulley concept Why the fixed pulley can not save effort , but movable pulley can save effort? Explanation: With movable pulley can save a half power, fixed pulley is a lever arm, no save effort nor effortless, but it can change the direction of force. Package Included: 1 x Pulley Physics Experiment Kit
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