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" Dim Lights Share a clea.nr URL: Hide Comments, Favorites, Suggested Videos, etc. There is a common perception that weight and mass are basically the same thing. This video aims to tease out the difference between mass and weight by asking people what makes a car difficult to push. The standard answer is that it is difficult to push because it's heavy. But heaviness is a measure of weight, the gravitational pull of the Earth attracting the car to Earth's center. When the car is pushed on a flat road, the force of gravity does not oppose the motion. Instead the resistance felt is an indication of the car's mass which determines its inertia. Inertia is the property of matter that means it tends to resist acceleration - the greater the mass, the less the acceleration for a given amount of force. Subscribe 109 videos 32,519 Like Add to Share Uploaded by 1veritasium on Feb 7, 2011 There is a common perception that weight and mass are basically the same thing. This video aims to tease out the difference between mass and weight by asking people what makes a car difficult to push. The standard answer is that it is difficult to push because it's heavy. But heaviness is a measure of weight, the gravitational pull of the Earth attracting the car to Earth's center. When the car is pushed on a flat road, the force of gravity does not oppose the motion. Instead the resistance felt is an indication of the car's mass which determines its inertia. Inertia is the property of matter that means it tends to resist acceleration - the greater the mass, the less the acceleration for a given amount of force. 320 likes, 14 dislikes Show more Uploader Comments ( 1veritasium ) Actually, it is the friction which is causing difficulty in moving the car. Ideally if there is no friction, whether rolling or sliding, even the slightest of the force would make the car move. You could actually be able to move the car with a push of your little finger if there is no friction at

You may have never seen a zebrafish in person. But take a look at the zebrafish in the short video above and you'll get to see something previously unknown to science: a visual representation of a thought moving through a living creature's brain. Read more: http://blogs.smithsonianmag.com/science/2013/01/video-see-a-thought-move-through-a-living-fishs-brain/#ixzz2JoumRzRn  Follow us: @SmithsonianMag on Twitter

Acid Rain: Invisible Menace At Clingman's Dome, environmental pollutants threaten the health of the trail's ecosystem.

Science is part of the world all around us. On this page, you will find resources to help students connect science content to things they can see and experience. Videos, Interactive Explorations, and Interactive Videos engage students and encourage them to explore more on their own with your help.

Many short videos on a large range of topics

Westerners associate terrorism in Pakistan with suicide bombers, but an emerging terrorist threat for Pakistani women is acid attacks.

An army of 1,001 volunteers set a new Guinness world record when they successfully created the largest ever human mattress domino rally. 

Very simple video about seeing and light. 

This song explains how the decay of a radioisotope has a half-life and how to use that half-life to solve decay problems. Corny but clear science. May appeal to some students!

Japan's Nuclear Crisis Explained in Four Minutes with clear graphics about the workings of the reactors.

"http://yt.cl.nr/cckAwavEKA0" This video shows how to make up a standard solution from a calculated mass of solute.

http://yt.cl.nr/MG86IFZi_XM This video takes you through the procedure for diluting a solution.