5.1 simple machine and their purpose

📚 Grade 9 Physics — 5.1 Simple Machines and Their Purpose Short Description: Learn what simple machines are, how they make work easier, and the purpose of the six basic types: lever, pulley, wheel and axle, inclined plane, wedge, and screw. ⚙️📘 Key idea: 🧠 Simple machines do not create energy—they make work easier by changing the size or direction of the force.