Gravity: How Do We Know?

The video begins by describing the thrilling experience of riding a roller coaster, highlighting the sensations of weightlessness and heaviness due to gravity. It then explains how gravity is the main force at work, similar to the forces astronauts experience during space travel. The video further explores gravity's role in everyday life, such as keeping Earth in orbit around the sun. Finally, it poses the question of how we know gravity exists despite being invisible, encouraging further exploration of this fundamental force.

What new insight or understanding did you gain from this video?