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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

The Nitrous Oxide Research Program is providing world class data  on N2O emissions from different soils under different management  practices, farming systems and climates. It is identifying N2O emission reduction strategies that may benefit farmers.

"http://yt.cl.nr/mAjrnZ-znkY" This song differentiates between the different families of organic compounds based on the sharing of functional groups in different positions on the carbon chain.

The following animations represent molecular-level models of three classifications of pure substance based on the chemical bonding involved - metallic (e.g. solid copper), ionic (e.g. solid sodium chloride), and intermolecular (e.g. liquid water, liquid oxygen). Animations comparing substances in different states, and undergoing changes of state, are also listed so that the differences in intraparticle and and interparticle bonding can be discussed. This topic is known for the student misconceptions and confusion it can cause without careful visualisation. Temperature is correlated with the degree of particle movement.

How do you add all of the slides in different PowerPoint presentations together? How do you keep them formatted the way they were originally designed? Watch this video to learn how.

What causes sea level rise? Why is the average sea-level rise around Australia higher than the global mean? And why is the sea rising at different rates around Australia?

What's the difference between a star and a planet? The line between them is starting to blur. 

Cool video that shows how a can of coke will sink in water but a can of diet coke wont due to the differences in the amount of sugar in the cans.

a series of short videos telling the creation stories of different cultures around the world

"http://yt.cl.nr/T1ux9D7-O38" This video shows 7 different inertia demos. Newton's 1st law of motion (law of inertia) states that objects at rest will remain at rest, and objects moving at constant velocity will remain moving at constant velocity unless acted upon by an outside unbalanced force.

Click on Schools Online to log into the 2011 Higher School Certificate Components Report for each school.This report indicates how consistently each individual student has performed across different components of the examination. The figures do not indicate the performance of an individual student relative to other students, but the student's performance in each component relative to his/her performance in other components. 

"http://yt.cl.nr/mezkHBPLZ4A"

"http://yt.cl.nr/_mCC-68LyZM" If you drop a heavy object and a light object simultaneously, which one will reach the ground first? A lot of people will say the heavy object, but what about those who know both will land at the same time? What do they think? Some believe both objects have the same gravitational pull on them and/or both fall to the ground with the same constant speed. Neither of these things is true, however. The force is greater on the heavy object and both objects accelerate at the same rate as they approach the earth, i.e. they both speed up but at the same rate.