Explore the playful side of physics. "I just love how apps like these get kids genuinely excited about science. " -- COOL MOM TECH. Experiment with levers, pulleys, inclined planes, levers, pulleys, inclined planes, wedges, wheel and axles, and screws. Discover how they work and investigate the invisible forces behind them in this sandbox app. Destroy a castle, make music, send satellites into orbit & more. App Store Editor's Choice. Parents' Choice Gold Award winner. Simple Machines integrates with STEM curriculum: kids can alter and test each machine to learn about force and motion, actions and reactions, inputs and outputs, conservation of energy, mechanical advantages, and tradeoffs. Get free activity sheets at tinybop.com. Simple Machines is No. 4 in Tinybop's Explorer's Library series, designed for curious kids ages 4+ to dive deep into big ideas. The apps in this series have won Best of the App Store, App Store Editors' Choice, Parents' Choice, and Children's Technology Review Editor's Choice awards. Features: Explore 6 simple machines: levers, pulleys, inclined planes, wedges, wheel and axles, and screws. Experiment with real world physics, actions and reactions, inputs and outputs. Learn about force and motion. Investigate the physics at work behind each machine. Sophisticated sound design rewards experimentation. Original artwork by James Gilleard. Smart features use your device's camera to bring your kids' world into the app. Learn new vocabulary in 40+ languages with interactive labels. Intuitive, safe, and kid-friendly design. Entertaining for kids and adults alike. Free handbook. Our expert-reviewed handbook is full of facts, interaction hints, and discussion questions to support learning in this app, in the classroom or at home.