# ALEX Classroom Resource

## Special Relativity: Crash Course Physics #42

Classroom Resource Information

Title:

Special Relativity: Crash Course Physics #42

URL:

https://www.pbs.org/video/special-relativity-crash-course-physics-42-zawb5t/

Content Source:

PBS
Type: Audio/Video

Overview:

So we've all heard of relativity, right? What is relativity? How does it relate to light? Motion? In this episode of Crash Course Physics, Dr. Shini talks to us about perspective, observation, and how relativity is really weird.

Content Standard(s):
 Science SC2015 (2015) Grade: 9-12 Physics 1 ) Investigate and analyze, based on evidence obtained through observation or experimental design, the motion of an object using both graphical and mathematical models (e.g., creating or interpreting graphs of position, velocity, and acceleration versus time graphs for one- and two-dimensional motion; solving problems using kinematic equations for the case of constant acceleration) that may include descriptors such as position, distance traveled, displacement, speed, velocity, and acceleration. NAEP Framework NAEP Statement:: P12.17: The motion of an object can be described by its position and velocity as functions of time and by its average speed and average acceleration during intervals of time. NAEP Statement:: P12.19: The motion of an object changes only when a net force is applied. NAEP Statement:: P12.22: Gravitation is a universal attractive force that each mass exerts on any other mass. The strength of the gravitational force between two masses is proportional to the masses and inversely proportional to the square of the distance between them. Unpacked Content Scientific And Engineering Practices:Planning and Carrying out InvestigationsCrosscutting Concepts: Scale, Proportion, and QuantityDisciplinary Core Idea: Motion and Stability: Forces and InteractionsEvidence Of Student Attainment:Students: Describe the motion of an object in terms of time, displacement, velocity, and acceleration in both one and two dimensions by analyzing a graph of that motion. Use data obtained from observation or experimental design of an investigation to analyze and explain the motion of an object in one and two dimensions. Use kinematic equations to solve for the displacement, velocity and acceleration of an object undergoing constant acceleration in both one and two dimensions using correct units.Teacher Vocabulary:model graph instant interval position velocity acceleration displacement distance speed average speed average velocity experimental design kinematic equations investigation analyze trajectory projectile range slope area under curve intercepts vector scalar coordinates origin magnitude units of measure significant figures trigonometric functionsKnowledge:Students know: How to use mathematical computations to solve for the motion of an object. How to analyze both linear and nonlinear graphs of motion. Laboratory safety procedures. Appropriate units of measure. Basic trigonometric functions of sine, cosine and tangent. How to determine area under a curve on a graph.Skills:Students are able to: Manipulate kinematic equations of motion. Interpret graphical data. Create graphical representations of data. Collect and organize experimental data. Follow written and verbal instructions. Make measurements of distance and time using standard units. Manipulate laboratory equipment. Work safely in collaborative lab groups.Understanding:Students understand that: The motion of an object can be predicted using mathematical models and graphical models.AMSTI Resources:ASIM Module: Intro to Graphing; Traveling Washer in 1D; Match the Graph; Motion of a Toy Car; Constant Velocity; Comparing Linear Speed and Circular Speed; Changing Velocity; Motion of a Falling Marble; Motion on an Incline; Motion Graphs; Treasure Hunt; Journey of a Physics Student; Tractor Pull; Projectile Motion Photo Worksheet; Horizontal Launch; Range vs. Angle; Basketball Toss; Acceleration on an Incline; Coefficient of Friction; Horizontal Circular Motion; Impulse Momentum; Collisions in 2D; Rotational Motion; Moment of Inertia; Conservation of Angular Momentum; Energy Exchange; Simple Harmonic Motion Science SC2015 (2015) Grade: 9-12 Physics 10 ) Plan and carry out investigations that evaluate the mathematical explanations of light as related to optical systems (e.g., reflection, refraction, diffraction, intensity, polarization, Snell's law, the inverse square law). Unpacked Content Scientific And Engineering Practices:Planning and Carrying out InvestigationsCrosscutting Concepts: Cause and EffectDisciplinary Core Idea: Waves and Their Applications in Technologies for Information TransferEvidence Of Student Attainment:Students: Based on evidence from investigations, students can trace the path of light refracted through a lens or reflected off a mirror and find the focal point. Based on evidence from investigations, students determine the relationship between intensity and distance from a light source. Experimentally demonstrate Snell's Law. Experimentally demonstrate the mirror and lens equations.Teacher Vocabulary:medium model graph image distance object distance focal point magnification critical angle refraction reflection diffraction interference constructive interference destructive interference principal axis center of curvature intensity inverse angle of incidence angle of reflection angle of refraction index of refraction speed of light system velocity polarization minima maxima order slit width slit separation object image real virtual inverted erect spherical aberration chromatic aberration total internal reflection law of reflection Snell's lLaw prism ray concave convex plane divergent convergent ray diagramsKnowledge:Students know: How light interacts at boundaries of different media. The wave properties of light. Basic trigonometric equations. How to do graphical analysis. Inverse and inverse square relationships. Types of images and how images are formed. Appropriate units of measure. How to identify a system.Skills:Students are able to: Develop an appropriate experimental procedure. Create a data sheet. Collect and organize experimental data. Follow written and verbal instructions. Make measurements using standard units. Effectively manipulate laboratory equipment. Work safely in collaborative lab groups. Manipulate equations. Interpret graphical data. Solve mathematical equations. Draw a light ray diagram and identify the location of an image.Understanding:Students understand that: The behavior of light is predictable mathematically allowing the development of optical devices to improve vision macroscopically and microscopically.AMSTI Resources:ASIM Module: This standard is related to standard 8—waves and should be a continuation of the discussion of waves. Light is discussed in earlier grades and that learning should be reinforced. This standard does not address color but color should be included when working on this standard. This standard provides examples covering an extremely wide range of optics. In this document, emphasis was placed on refraction and reflection; however, the topics of diffraction and interference should also be considered for historical and mathematical relevance. Illuminance; Plane and Curved Mirrors; Concave Mirror; Snell's Law; Convex and Concave Lenses; Convex Lens; Polarized Filters and Meter Basics
Tags: light, motion, physics, relativity