# time dilation and length contraction ppt

The special theory of creativity is one of the most popular ideas in physics. the observer at the different time intervals. Imagine a light clock which consists of two mirrors and beam of light reﬂecting back and forth between the mirror! One of the earliest and most well-known thought experiments to feature time dilation is the famous Twin Paradox, which demonstrates TIME DILATION and LENGTH CONTRACTION from “inside” frame of reference sensor sensor light path (viewed from inside ship) d inside ship t is time of transit measured by a clock inside the ship as measured by someone “looking in” from both Understanding why moving clocks run slow. Calculating Length Contraction: The Distance between Stars Contracts when You Travel at High Velocity Suppose an astronaut, such as the twin discussed in Simultaneity and Time Dilation, travels so fast that γ = 30.00. Time dilation ! The Lorentz Factor is a convenient tool when discussing length contraction and time dilation because it converts these equations into these vastly simpler forms. If we measure the length of anything moving relative to our frame, we find its length L to be smaller than the proper length L 0 that would be measured if the object were stationary. This is a presentation regarding Time Dilation, Twin Paradox and Length Contraction. Over a 15 year period (1905-1920) came the most explosive ideas of the century. Conclusion We have thus described and explained the twin paradox. Length contraction L is the shortening of the measured length of an object moving relative to the observer’s frame. Simultaneity A Flash animation that covers the material of this sub-section has been prepared. Einstein's theory of special relativity includes electricity and magnetism in a simple, logical extension of the relativity of Galileo and Newton. It requires the 1.) It is also known as Lorentz contraction or Lorentz–FitzGerald contraction (after Hendrik Lorentz and George Francis FitzGerald) and is usually only noticeable at a substantial fraction of the speed of light. Its conclusions, including time dilation, length contraction, and E=mc 2 have changed profoundly our ideas of time and space, matter and energy. Special Relativity: Time Dilation and Length Contraction SPH4U Einstein’s Postulates All laws of physics are valid in all inertial (non-accelerated) reference frames. Length Contraction The e ect of time dilation, discussed in the previous lecture, seems self-contradictory? time dilation, length contraction and Doppler Effect - all at once Bernhard Rothenstein1 and Stefan Popescu2 1) Politehnica University of Timisoara, Physics Department, Timisoara, Romania brothenstein@gmail.com 2) Siemens AG, Erlangen, Germany Length contraction ! After compensating for varying signal delays due to the changing distance between an observer and a moving clock (i.e. Save teachers time and engage students with a new, simpler interface! New velocity addition law Please read Chapter 7 of the text ©Sidney Harris Albert Einstein ! Time Dilation vs Length Contraction Length contraction and time dilation are two important effects of the theory of relativity. Time Dilation Examples The effects of time dilation are used often in science fiction stories, dating back to at least the 1930s. 2.1 The Need for Aether 2.2 The Michelson-Morley Experiment 2.3 Einstein’s Postulates 2.4 The Lorentz Transformation 2.5 Time Dilation and Length Contraction 2.6 Addition of Velocities 2.7 Experimental Verification 2.8 Twin Paradox 2.9 Space-time 2.10 2.11 Scenario 1! 10Chapter32time dilation and length contraction_理学_高等教育_教育专区 90人阅读|12次下载 10Chapter32time dilation and length contraction_理学_高等教育_教育专区。大学物理(英文版)第一学期教案教程,课后作业答案 They move at very high velocities (β ~ 0.9999) and have very short lifetimes, τ = 2 × 10-6 s, as measured It is very similar to this discussion. Muons - An Example of Time Dilation and Length Contraction Muons are unstable particles created when cosmic rays interact with the upper atmosphere. Length contraction is the phenomenon that a moving object's length is measured to be shorter than its proper length, which is the length as measured in the object's own rest frame. In this post, we will investigate the evidence, from Einstein’s thought experiments and subsequent experimental validation for the following: There are two observers, an insider and an outsider. The Twin Paradox Up: Relativistic Mechanics [8 lectures] Previous: Length Contraction Time Dilation, The Doppler Effect The calculation of an elapsed time interval must take into account that the moving clock will be in different positions w.r.t. time dilation: The slowing of the passage of time experienced by objects in motion relative to an observer; measurable only at relativistic speeds. Here is a table of some relativistic speeds given in fractions of the speed of light c and their associated Lorentz Factor. Yes! Time dilation Length contraction along the direction of motion Space and Time are relative Relativity of Simultaneity Velocities are relative, except for that of light, and add up in such a way that they never exceed the velocity of light. Derivation of Time Dilation! Lorentz factor : The factor, used in special relativity, to calculate the degree of time dilation, length contraction and … from this Einstein figure out E = mc2 length contraction, time dilation, and much more.The role of special relativity is to study how motion looks from a different perspective. Here we will proceed by deriving time dilation and then deducing length contraction from it. There is a two-way light-clock which will remain completely at rest with the insider throughout the thought-experiment.Einstein's ("Parallel") Thought-Experiment for Length Contraction Now that the light has reached the mirror, let's examine what happens on the second leg of its journey [See Diagrams B1 & B2]. Physics- video :Arvind K. Gathania 16,583 views Time Dilation and Length Contraction This section is part of the HSC Physic syllabus Module 7: Nature of Light under Light and Special Relativity. Since the time is limited to eight minutes, it is not an in-depth presentation. One “tick” is when the light goes from one mirror to the other and back again! Note4_SpecialRelativity_ppt.pptx from PHYS 3652 at The University of Hong Kong. AK LECTURES 29,554 views 4:32 Time Dilation:Theory of Relativity - Duration: 10:26. The relativity of simultaneity and the relativity of length lead naturally to the strangest consequences of relativity theory: time dilation and length contraction. But since clocks of moving object slow down, the time elapsed on a clock taken on the trip is only Geodesic = shortest path between two points. Lecture 4 Special Relativity Learning Objectives Time dilation & proper time Length contraction & Exercise: Suppose your friend got a very serious disease with no cure right now and he will die in 3 months. Time dilation Length contraction Mass dilation Vega is 25 light years away, assume travel is at 0.999 c. Time for trip should be about 25 years. Time dilation is a difference in the elapsed time as measured by two clocks due to a relative velocity between them or to a difference in gravitational potential between their locations. Time Dilation and Length Contraction Example - Duration: 4:32. By the end of this chapter, you will understand how time dilation and length contraction fit together with time skew in a fully consistent model that beautifully fits a wide range of evidence. Time Dilation When time dilation occurs, an observer will measure a time which is longer than the event itself in its own frame of reference. You are in the same inertial frame View 4. Special Relativity: Time Dilation And Length Contraction PPT Presentation Summary : Special Relativity: Time Dilation and Length Contraction SPH4U Einstein’s Postulates All laws of physics are valid in all inertial (non-accelerated) reference Source : Ch. A final mathematical supplementary document on time dilation and length contraction may be accessed here. Blog Oct. 17, 2020 How to make a video presentation with Prezi in 6 steps Oct. 14, 2020 Video Time Dilation Explained for Engineering Physics: The most important and famous results in Special Relativity are that of time dilation and length contraction. Time dilation and length contraction imply one another. Time Dilation, The Twin Paradox, and Length Contraction Relative Velocity Time Dilation Length Contraction When two observers are in relative uniform motion and are not influenced by any gravitational mass, the point of view of each will be that the other's moving Einstein’s Postulates Light travels at c = 3.0 x 108 m/s relative to all reference frames. These effects are extremely valuable in describing some of the most complicated phenomena encountered. Einstein's Special Relativity states that the laws of physics are the same in all inertial frames, specifically the same on a steadily moving train as they are on the ground.But the laws predict that the speed of light, called c, has a precise value, close to three hundred thousand kilometers per second. Example 1. Time dilation means that relative to a clock taken to be at rest, a moving clock runs slow, so that relative to the moving clock the amount of time recorded by the clock at rest expands or dilates. 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