# (I'm 14 and still learning physics so I obviously don't know as much

• Cbray
In summary: The equation says that when you take energy away from a particle (let's say an electron) you are also removing its mass. The more energy you remove, the more mass is removed.
Cbray
(I'm 14 and still learning physics so I obviously don't know as much as you smart guys yet :P)
E=MC^2, is that saying that If you take energy (I'm guessing the electrons) out of a particle or (I forgot the name but it's a group of particles) your also losing matter, if so does that mean electrons have mass? how much?

Sorry I'm a bit confused, this probably sounds dumb :L

Edit: And what does he mean by C^2 (I know its the speed of light squared, but what does it actually mean within the equation)?

I'm also wondering, what is energy itself. There is different kinds, like kinetic and so forth but what actually is energy?

Cbray said:
(I'm 14 and still learning physics so I obviously don't know as much as you smart guys yet :P)
E=MC^2, is that saying that If you take energy (I'm guessing the electrons) out of a particle or (I forgot the name but it's a group of particles) your also losing matter, if so does that mean electrons have mass? how much?

Sorry I'm a bit confused, this probably sounds dumb :L

Edit: And what does he mean by C^2 (I know its the speed of light squared, but what does it actually mean within the equation)?

I'm also wondering, what is energy itself. There is different kinds, like kinetic and so forth but what actually is energy?
It means, if we can at max extract E energy from mass m leaving nothing of mass, then ratio of E to m is the square of the speed of light.

You may be wondering why c is there.

Well, this equation is the product that emerged by keeping principle in mind that " No object can observe and exceed the speed of the light"

I'm not aware of an actual meaning of c2 in the energy formula. The initial expression was m = m0 + m0v2/2c2 + m03v4/8c4 + m05v6/16c6 + etc...

He then multiplied both sides with c2 resulting in

mc2 = m0c2 + m0v2/2 + etc...

Because m0v2/2 was the expresion of kinetic energy he deduced that mc2 must also be the expression of an energy and because it's the sum of all those energies (some known like kinetic energy, others unknown) it must represent the total energy of the system.

It turnes out he guessed correctly!

Last edited:

## 1. What is the difference between mass and weight?

Mass refers to the amount of matter an object contains, while weight refers to the force of gravity acting on an object. Mass is measured in kilograms, while weight is measured in Newtons (N). Mass is a constant property of an object, while weight can vary depending on the strength of gravity.

## 2. What is the difference between speed and velocity?

Speed refers to how fast an object is moving, while velocity refers to the speed and direction of an object's motion. Speed is a scalar quantity, meaning it only has magnitude, while velocity is a vector quantity, meaning it has both magnitude and direction.

## 3. How does gravity work?

Gravity is a force of attraction between two objects with mass. The larger the mass of an object, the stronger its gravitational pull. The force of gravity also depends on the distance between two objects, as the force decreases as the distance increases.

## 4. What is the difference between potential and kinetic energy?

Potential energy is the energy an object has due to its position or state, while kinetic energy is the energy an object has due to its motion. Potential energy can be converted into kinetic energy and vice versa.

## 5. What is the relationship between force, mass, and acceleration?

Newton's Second Law of Motion states that force is equal to mass multiplied by acceleration (F=ma). This means that the greater the force applied to an object, the greater its acceleration will be, and the greater the mass of an object, the more force is needed to accelerate it.

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