In this simple exploration, a coiled phone cord slows the motion of a wave so you can see how a single pulse travels and what happens when two traveling wave pulses meet in the middle.
Definition of period and frequency for an object moving in a circle. Connecting period and frequency to the magnitude of the angular velocity.
Predicting which spinning disc has a larger radius from angular velocity and the linear velocity of a point on the edge.
Foil Leaf Electroscope. Aluminum leaves repel in the presence of a charged object. Created by Brit Cruise.
This video segment from 'Earth: The Operators' Manual' explores how we know that today's increased levels of CO2 are caused by humans burning fossil fuels and not by some natural process, such as volcanic out-gassing. Climate scientist Richard Alley provides a detailed step-by-step explanation that examines the physics and chemistry of different "flavors," or isotopes, of carbon in Earth's atmosphere.
This video introduces the concept of daylighting - the use of windows or skylights for natural lighting and temperature regulation - and how it is a building strategy that can save operating costs for homeowners and businesses.
Buddhism is one of the world’s largest religions and originated 2,500 years ago in India. Buddhists believe that the human life is one of suffering, and that meditation, spiritual and physical labor, and good behavior are the ways to achieve enlightenment, or nirvana.
Human biology is an interdisciplinary area of study that examines humans through the influences and interplay of many diverse fields such as genetics, evolution, physiology, anatomy, epidemiology, anthropology, ecology, nutrition, population genetics, and sociocultural influences; it is closely related to physical anthropology.
Learn how friction causes a material to heat up and melt. Rub two objects together and they heat up. When one reaches the melting temperature, particles break free as the material melts away. Arabic Language.
Students will collect data on an investigation where two or more substances are mixed together. Students will analyze the investigation to decide the type of change, chemical or physical, that occurred during the investigation. Students will use their observations from the investigation to create a short movie where they will describe the data they used to determine the type of change that occurred during their investigation. This lesson will work best for classrooms equipped with classroom tablets or schools that allow students to bring their own device. This lesson results from a collaboration between the Alabama State Department of Education and ASTA.
The population projections presented in this publication cover the period 30 June 2008 to 2101 for Australia and 30 June 2008 to 2056 for the states, territories, and capital cities/balances of state.
David explains the meaning of angular displacement, angular velocity, and angular acceleration. Created by David SantoPietro.
What would fall faster on the moon, a brick or a feather? Created by Sal Khan.
David explains how to solve problems where an object rolls without slipping. Created by David SantoPietro.
In this activity about electricity and magnetism, learners discover how a doorbell works. A coil of wire with current flowing through it forms an electromagnet that acts similar to a bar magnet. The coil will magnetize an iron nail and attract it in a remarkably vigorous way.
In this activity students will learn to calculate the speed and acceleration of an object using tornado tubes and determine if mass affects the speed of the object.
In this demonstration students are given a position, velocity or acceleration graph showing the motion of an object. They are asked to write a short description of the motion, and make predictions by completing the remaining two graphs.
An introduction to the difference between distance traveled and displacement. Created by Sal Khan.
In this activity, candy models are used to demonstrate the features of the Earth, including its internal structure and layers. Students learn why models are essential in Earth science and answer questions about how their candy models do and do not compare with the actual Earth.
Join Tarissa and Sabrina as they measure and compare the volume of different sounds across New York City in this video from DragonflyTV.