======Newton's Cradle====== **Materials: **{{$demo.materials_description}}\\ **Difficulty: **{{$demo.difficulty_description}}\\ **Safety: **{{$demo.safety_description}}\\ \\ **Categories:** {{$demo.categories}} \\ **Alternative titles:** ====Summary==== {{$demo.summary}} ====Procedure==== - Pull back one of the spheres in the cradle to a small angle and release it. - Observe that one sphere on the opposite side swings out with the same motion. - Repeat the experiment with two, three, or four spheres pulled back and released together. - Note how the same number of spheres exit on the opposite side, while the middle spheres remain nearly stationary. ====Links==== Newton's Cradle - Incredible Science: {{youtube>0LnbyjOyEQ8?}}\\ Giant Newton's Cradle - Mythbusters - Banijay Science: {{youtube>liMsKw2XVqw?}}\\ 📄 Newton's Cradle - Classroom Physics Demos: [[https://demos.smu.ca/demos/mechanics/136-newton-s-pendulum]]\\ ====Variations==== * Try releasing spheres from a larger angle to see how the motion changes. * Release one sphere from each end at the same time and watch the interactions in the middle. * Use different sized Newton’s cradles to compare motion with larger or smaller spheres. ====Safety Precautions==== * Ensure the Newton’s cradle is placed on a stable surface to prevent it from tipping over. * Keep fingers clear of the moving spheres to avoid pinching. ====Questions to Consider==== * Why does the same number of spheres swing out on the opposite side as were released? (Because momentum and energy are transferred through the line of spheres.) * Why do the middle spheres appear to stay still? (They transfer energy and momentum but do not visibly move.) * What energy transformations occur during the collisions? (Kinetic energy transfers between spheres, with small amounts lost as sound and heat.)