Question

What If Everyone on Earth Jumped at Once?

Answer 1

Short Answer: Nothing

Explanation: There are more than 7 billion humans of earth. That means total human weight could be approximately 7*80 billion kg. However, the total mass of the earth is 5.9*1024 kg, which is comparatively way too high. According to Sir Newton, there is always an equal and opposite reaction to every action. So, technically, there will be a tiny impact.

Answer 2

Because people are spread somewhat equally around the planet's spherical surface , if we all jumped in place, nothing much would happen — all our lift-offs and impacts would cancel each other out, resulting in zero net force on the Earth, according to work by physicist Rhett Allain.

So let's imagine that everyone could congregate together in one place. Doing so would probably make it easier to synchronize our jump anyway.

Using the laws of conservation of momentum and energy, Allain, a physicist at the University of Southeastern Louisiana and blogger at Dot Physics, calculated what would happen to the 6-trillion-trillion-kilogram Earth under these circumstances. For simplicity's sake, he assumed the average human could jump one foot (30 cm) high and that we'd all be jumping from exactly the same point.