# How Do You Explain E Mc2 To A Child?

## What is the formula E mc2 used for?

Einstein’s equation E = mc2 shows that energy and mass are interchangeable.

The theory of special relativity explains how space and time are linked for objects that are moving at a consistent speed in a straight line.

One of its most famous aspects concerns objects moving at the speed of light..

## How do you explain relativity to a child?

1. The principle of relativity: The laws of physics are the same for any inertial reference frame. 2. The principle of the speed of light: The speed of light in a vacuum is the same for all observers, regardless of their relative motion or the motion of the source of the light.

## Does E mc2 apply to humans?

No. First of all, the body does not have that much energy in the first place—a body has mass that perhaps could be converted to energy, but very little of it is actually in the form of energy currently, so don’t say it has that much energy.

## What is the proof of E mc2?

Einstein’s theory of special relativity (1905) shows that matter (as mass) and energy can be converted into each other according to the famous equation E = mc2, where E is energy, m is mass, and c is the speed of light.

## What does E mc2 mean in simple terms?

E = mc2. It’s the world’s most famous equation, but what does it really mean? “Energy equals mass times the speed of light squared.” On the most basic level, the equation says that energy and mass (matter) are interchangeable; they are different forms of the same thing.

## How do you solve E mc2?

To convert from g to kg, for example, divide by 1,000. Square the speed of light. The speed of light is approximately, 300,000,000 m per second; (300,000,000 m/s)^2 equals 90,000,000,000,000,000 meters squared per second squared, or 9 x 10^16 m^2/s^2. Multiply the result by the mass of the object in kilograms.

## What is Theory of Relativity in simple words?

What is general relativity? Essentially, it’s a theory of gravity. The basic idea is that instead of being an invisible force that attracts objects to one another, gravity is a curving or warping of space. The more massive an object, the more it warps the space around it.

## What is the difference between the two theories of relativity?

The “General Theory of Relativity’ is related to gravity. … The difference between the two theories is that the theory of general relativity throws light on the force of gravity with respect to curving four-dimensional space-time. As per Einstein, the accelerative and gravitational forces are equal and same.

## What does relativity mean?

the quality or state of being relative1a : the quality or state of being relative. b : something that is relative. 2 : the state of being dependent for existence on or determined in nature, value, or quality by relation to something else.

## Why speed of light is constant to all observers?

Because all information is carried by light at a finite speed, to satisfy the requirements of the basic postulates of Special Relativity: All uniformly moving observers see the same physical laws. All observers measure the same speed of light.

## Why is C the speed of light?

The Long Answer. In 1992 Scott Chase wrote on sci. physics that “anyone who read hundreds of books by Isaac Asimov knows that the Latin word for `speed’ is `celeritas’, hence the symbol `c’ for the speed of light”.

## Why is C Squared?

Equivalent units are energy in joules, per mass in kilograms and c in terms of meters/sec. … Just because there is a c in the formula for rest mass energy does not mean that the particle has that speed. It turns out that the speed of light squared, c 2 , just so happens to be the conversion factor from mass to energy.

## Why is speed of light squared?

The reason is that energy, be it light waves or radiation, travels at the speed of light. … But why is the speed of light squared? The reason is that kinetic energy, or the energy of motion, is proportional to mass. When you accelerate an object, the kinetic energy increases to the tune of the speed squared.

## What did Einstein mean by time is relative?

In the Special Theory of Relativity, Einstein determined that time is relative–in other words, the rate at which time passes depends on your frame of reference. … The faster a clock moves, the slower time passes according to someone in a different frame of reference.

## What are the units of E mc2?

Each of the letters of E = mc 2 stands for a particular physical quantity. Writing them out in full we get: In other words: E = energy (measured in joules, J) m = mass (measured in kilograms, kg) c = the speed of light (measured in metres per second, ms -1 ), but this needs to be “squared”.

## How is e mc2 derived?

Nuclear weapons (such as A- and H-bombs) are built on one principle; that mass can be turned into energy, and the equation that exactly predicts that conversion is E = mc 2 . So what has that to do with Special Relativity? The answer is that E = mc 2 is derived directly from Special Relativity.

## What is the dimension of E mc2?

Brian Greene has taught me to think about E = mc2 in multiple dimensions of application. In the traditional dimension of theoretical physics Einstein’s formula informs us that all energy (in any form) is equivalent to mass (also known as matter) multiplied by the speed of light (‘c’) squared.

## Why is E mc2 so important?

When a particle meets its antiparticle, they annihilate eachother, leaving only a pulse of energy; by the same token, a high-energy photon can suddenly become a particle-antiparticle pair. Altogether, says Hogg, “E = mc2 has been very important in diagnosing and understanding properties of antimatter.”