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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

Tsunami: why and where they originate and propagate.  A trip through the Earth's history from its formation to the present tectonic motions causing earthquakes and tsunamis. 

"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.

Good simulation showing how individual particles move in a longitudinal and transverse wave

Women's Track & Field world records, as recognized by the International Association of Athletics Federations (IAAF).

Quiz

Stimulus video to ask students to dramatise inertia etc. Corny but funny!

Interactive graphs of gold medal-winning times for Olympians in a range of sports over the span of the Olympics.

The graph below shows the progression of gold medalists' times for the 100-meter sprint since 1896. Use the zoom controls at the top right to get a closer look, and hover over the points to learn each year's result. While zoomed, click and drag the timeline to view later years.