Space, Time, Mass and Energy

8/13/2019 Space, Time, Mass and Energy

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Lets Play!


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SPACE


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MASS


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ENERGY


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TIME


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Space, Time, Massand Energy

According toEinstein


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A. Length/ Space ContractionB. Time Dilation

C.Relativity of MassD.Equivalence of Mass and

EnergyE. Significance of the Special

Theory


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Length/ Space Contraction

The relative motion of frames of

reference affect the measurement of

space and time such that themeasurements made by an observer

on distances and events in a frame of

reference with respect to himdepends on the relative speed vand

the speed of light c.


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The length of an object is maximum

when measured in a frame which is atrest, the length minimumwhen

measured in movingreference frame.

Note: v


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Ex.L0=1m, v= 2.7x108m/s


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Time Dilation

Time is also affected by relativemotion. A clock moving with respect

to an observer appears to move more

slowly than it does when it is at restwith respect to the observer.


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Relativity of Mass

The mass of a body changes as thebody is set into motion.

A moving object will be more massive

than an object at rest.

Note: if v


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Equivalence of Mass and

EnergyMass is a form of energy

E=mc2

C2or 9x1016 Joules/kg

1 kg mass = 9 x 1016joules

This means that a small amount ofmatter can be converted to anenormous amount of energy.


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Significance of the Special

Theory of Relativity

1. Effect on Newtionian Mechanics(Classical Mechanics)

2. The paractical use of relativity isin atomic and nuclear physics.

3. Philosophical impact on thecourse of physical theory

4. 4. With the birth of the SpecialTheory of Relativity, the idea ofthe ether has to be discarded.

Space, Time, Mass and Energy

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