Lesson: Length ContractionPhysics
In this lesson, we will learn how to calculate the change in the observed length as measured by an observer moving with a relative velocity.
Sample Question Videos
Worksheet: 7 Questions • 1 Video
A spaceship that has a proper length of m moves at relative to Earth. What is the spaceship’s length as measured by an observer on Earth?
An observer located at the origin of an inertial frame sees the flash of a flashbulb occur at the position and at the time . The system is moving along the -direction of at a velocity of .
At what time in the system did the flash occur?
At what -position did the flash occur as measured in the system?
A spaceship (A) is moving at speed with respect to another spaceship (B). Observers in A and B set their clocks so that the event at of turning on a laser in spaceship B has coordinates (0, 0, 0, 0) in A and also (0, 0, 0, 0) in B. A photon from the laser in spaceship B arrives at at in the frame of ship A.
What will be the time value at which the observer in spaceship B measures the photon’s arrival?
What displacement value will the observer in spaceship B measure for the position of the arriving photon?