What your child will discover
Help the child understand that simple machines change how forces are applied. They may reduce the force required by increasing distance, change direction, or support controlled movement.
Lesson 256 of 300
What Are Simple Machines?
Learn how levers, wheels and axles, pulleys, inclined planes, wedges, and screws change the force, distance, direction, or speed involved in work.
4–5 yearsScience, Technology & MediaAdult guided
Science, Technology & Media · KnowledgeForKids.com
Listen together · adult controls the audio
The spoken lesson
"Simple machines change how a force is applied. A lever rotates around a fulcrum. A wheel and axle rotate together. A pulley guides a rope or cable and may change force direction. An inclined plane uses a longer sloped path to reduce the force needed for lifting. A wedge changes force into separating or holding force. A screw is an inclined plane wrapped around a cylinder. Simple machines do not create energy. They trade force, distance, direction, or speed, and friction affects their performance. Many tools combine several simple machines. Simple machines change how force and distance are used; they do not create energy." DESIGN REQUIREMENTS: Use oversized blunt models and clear mechanical diagrams. Avoid neck-level cords, sharp wedges, metal screws, pinch points, heavy loads, or claims of free energy.
Words to notice together
SIMPLE MACHINELEVERFULCRUMWHEEL AND AXLEPULLEYINCLINED PLANEWEDGESCREW
Make it real
Pause, point, name what you notice, and connect the idea to something familiar in your child's day. Repetition, a calm voice, shared attention and dependable care matter more than finishing quickly.