Head to https://squarespace.com/floatheadphysics to save 10% off your first purchase of a website or domain using code FLOATHEADPHYSICS

In this video, we rediscover Einstein's equivalence principle. It solves one of the biggest mysteries of Newtonian physics - why gravitational mass = inertial mass. But in doing so, Einstein completely reinvents the ideas of gravity. Starting with gravity being an illusion. A mere side effect of the 'ground' accelerating 'upwards'.

Basket Ball Feather Video
   • Brian Cox visits the world's biggest ...  

Hammer Feather Video
   • David Scott does the feather hammer e...  

This video is sponsored by squarespace