Most-viewed video of 2017: Why don't perpetual motion machines ever work? #10YearsofTEDEd* Perpetual motion machines — devices that can do work indefinitely without any external energy source — have captured many inventors’ imaginations because they could totally transform our relationship with energy. There’s just one problem: they don’t work. Why not? *We're counting down to our 10th birthday on March 12 by sharing ten of our most-viewed videos —one published in each year that we’ve been aroun

Perpetual motion machines could totally transform our relationship with energy ... if only they worked: | TED-Ed

Incredible Perpetual Motion Globe | Science Experiments

• A perpetual motion machine tries to produce energy without any energy input. • There are two main types: • Type I: Produces energy from nothing, violating the First Law of Thermodynamics (Conservation of Energy). • Type II: Converts all heat into work with 100% efficiency, violating the Second Law of Thermodynamics. 2. Why It’s Impossible • In the real world, there is always friction, air resistance, and heat loss, which continuously drain energy from the system. • Therefore, no machine can mo