Length Contraction Affect on Mass: Physics Explained

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In summary, the conversation discusses the concept of mass fluctuation at near light velocity and how it is conventionally viewed in physics. It is noted that the older convention was for mass to increase by a factor of gamma, while modern convention considers mass to be invariant. The concept of length contraction is also mentioned but is not directly related to the fluctuation of mass.
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NotAMethDealer
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If an object is going at near C(light velocity) and undergoes length contraction. Does the mass fluctuate?I apologize if it is an obvious question but I'm a little rusty on my physics.
 
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This is more a matter of convention than a matter of fact. The older convention was to say that mass would go up by a factor of gamma: http://en.wikipedia.org/wiki/Relativistic_mass#Relativistic_mass In that convention, momentum was still p=mv. Since about 1950, relativists have no longer used that convention. They take mass to be invariant and write [itex]p=m\gamma v[/itex]. Either way, it's not an effect caused by length contraction.
 

FAQ: Length Contraction Affect on Mass: Physics Explained

1.

What is length contraction and how does it affect mass in physics?

Length contraction is a phenomenon in which the length of an object appears shorter when it is moving at high speeds. This is a consequence of Einstein's theory of relativity. According to this theory, as an object's velocity increases, its length in the direction of motion decreases. This, in turn, affects the object's mass, which also increases with velocity.

2.

Why does length contraction occur and how is it related to mass?

Length contraction occurs because of time dilation, another effect of Einstein's theory of relativity. When an object is moving at high speeds, time appears to pass slower for that object. This affects the perception of length, as an object's length is measured over a certain period of time. As the time appears to pass slower, the length of the object appears shorter. This is directly related to mass, as an object's mass is dependent on its velocity and length.

3.

How is the relationship between length contraction and mass explained in the theory of relativity?

The theory of relativity states that as an object's velocity increases, its length contracts and its mass increases. This is because as an object moves closer to the speed of light, it requires more energy to accelerate and maintain its velocity. This increase in energy results in an increase in mass, and the object's length appears shorter due to time dilation.

4.

Does length contraction have any practical applications in everyday life?

Length contraction and its effect on mass have significant practical applications in various fields, including particle accelerators and space travel. In particle accelerators, the contraction of an object's length allows for particles to reach higher speeds and collide with greater energy. This helps scientists study the fundamental properties of matter. In space travel, the concept of length contraction and time dilation must be taken into account when calculating the effects of high-speed travel on astronauts and their equipment.

5.

Can length contraction and its effect on mass be observed in experiments?

Yes, length contraction and its effect on mass have been observed and proven through various experiments. One of the most famous experiments that demonstrated this phenomenon is the muon experiment, where muons (subatomic particles) were accelerated to high speeds and measured their decay rates. The results of this experiment supported the predictions of the theory of relativity, showing an increase in the mass of the muons as they moved at high speeds.

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