{ "item_title" : "How Big Machines Actually Work", "item_author" : [" Oliver Grant "], "item_description" : "What makes an excavator powerful enough to move tons of earth, a train strong enough to pull enormous loads, or an aircraft capable of leaving the ground?How Big Machines Actually Work takes curious readers ages 8-12 beyond basic machine facts and into the science and engineering that make powerful machines possible.This book explains how energy, force, motion, hydraulics, engines, motors, traction, aerodynamics, and control systems work together inside real machines. Instead of simply naming parts, it shows why those parts are designed the way they are and how they cooperate to get the job done.Inside this book, kids will discover: - How excavators multiply force- How trucks transfer engine power- Why trains grip steel rails- How aircraft create lift and thrust- How industrial robots move precisely- How gears, motors, and hydraulics work- Why engineers design machines differentlyClear explanations introduce real STEM concepts without making the book feel like a textbook. Young readers learn to follow cause and effect, understand connected systems, and see familiar machines with new eyes.Perfect for curious kids, young engineers, homeschool learners, classroom enrichment, science lovers, and educational gifts.For children who already love machines and are ready to understand the science behind how they really work, this book offers a deeper, more rewarding engineering adventure.", "item_img_path" : "https://covers1.booksamillion.com/covers/bam/9/79/819/280/9798192800096_b.jpg", "price_data" : { "retail_price" : "14.99", "online_price" : "14.99", "our_price" : "14.99", "club_price" : "14.99", "savings_pct" : "0", "savings_amt" : "0.00", "club_savings_pct" : "0", "club_savings_amt" : "0.00", "discount_pct" : "10", "store_price" : "" } }

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