conceptual physics Demo of Inertia

[mikelamid]

looks like Chuck Norris XD

[Dreldams]

I love how people are thinking without thinking. Who knew it was possible? They are missing the depth of the problem. Yes, it moves as a result of friction, but where is the force propelling it coming from? In a vacuum of space it would keep going, why? What is moving it when the applied force is gone?

[Nabo00o]

Sry for double post but wow! This video is great for spotting people who are totally unaware of the box they are living in in regards to science! We actually do like to know the causes of the effects we observe, like for example that the tides are not just a fact, but that they are caused by the moon's orbit around earth etc.

But, science still struggles with MANY underlying questions and problems to which we can give no explanation other than that "it simply is", like this teacher does.

[Nabo00o]

Well ok, he makes them aware of the problem, now I think he is actually a good teacher.

If there is another type of force keeping it in motion, where does it come from?

[M0N0LITH27]

BTW, yes I know space isn't a perfect vacuum, but it's as close as your going to get.

[M0N0LITH27]

It is rolls because the table creates enough friction to keep the bottom from moving forward, but since it still has momentum, and it is heavier in the middle than at the bottom it is top heavy the middle is always trying to tip over causing it to roll. Now give me my nobel prize. part of physics is knowing you can always break things down farther.

[M0N0LITH27]

The answer Is "momentum" and There is always friction unless in a perfect vacuum (outer space), otherwise the cylinder wouldn't roll when you push it, it would glide across the table without rolling until acted upon by an external force such as the wall.

[UCMolosser]

@M0N0LITH27 His answer, that the reason is inertia, is equivalent to yours, that the reason is momentum. Inertia is resistance to change in momentum. They are fundamentally linked concepts.

[MrHobiecat]

Lets make this even simpler. In physics there is no WHY.

The universe IS what it IS, and it DOES what it DOES. The purpose of physics is to understand WHAT it is, and WHAT it does.

There is no WHY.

[MrHobiecat]

Physics teacher and he doesnt know why it keeps going?

WHY would it NOT keep going?!

An object in motion tends to stay in motion. Ever hear of a guy named Issac?

[rub1k]

@MrHobiecat If no other forces are applied on the body smartass

in this case, friction is applied, so it should stop. So what keeps it in motion? Inertia.

[MrHobiecat]

@rub1k WHAT friction?! a steel canister rolling on a hard surface has nearly zero rolling resistance, and at the speed its moving nearly zero air friction.

Interia is NOT a force. this prof doesnt understand physics.

[UCMolosser]

@MrHobiecat @MrHobiecat He never said inertia is a force. In fact, he said, "What's the force keeping that going? No force."

Though you are right that there is very little friction. That's why he rolls it instead of sliding it so the Newton's 1st Law can be demonstrated.

[jpmorgan187]

clearly god is keeping it going.  or maybe jesus is. just kidding, god is fake! physics is awesome!

[CantBeDisplayed]

It's inertia. If you can truly explain why it keeps going by some other means, you deserve the nobel prize...The "Push" force is gone once he moved his hand away

[jayfulf]

@CantBeDisplayed Because the energy applied to the object needs to be dissipated by means of friction, gravity, or some other opposing force. Unless there is an opposite an equal force from the moment of the push, there is energy left over for the object to continue moving. Energy cannot disappear.

[planetofthescums]

@CantBeDisplayed up up down down B A select start

[rahmatharchitect]

@CantBeDisplayed .................its Clear ..Because of the force..which he applied with his hand!.....you said ,"he moved his hand away" but the force which he applied is enough to keep that object moving!.......make correct if wrong!

[IronHuge]

@rahmatharchitect Yes, the force he had applied is enough to keep that object moving, because nothing stops it. But why? Why we just need to apply a force at the beginning, then the object can keep going? This is the question. This "phenomenon" is given the name "inertia" which we usually take for granted.

[ahhh157]

maybe it kept going because he pushed it :3

[MrBdubsSAS]

We do know why it keeps going. Ask yourself, why should it stop? If nothing is causing it to stop, then it should keep going... It doesn't expend energy to continue, just to change...

[EGMAG]

@MrBdubsSAS It has to do with the initial motivating force, the pull of gravity downward as the centrifical force keeps it spinning, until friction causes its forward motion energy to expend.

[BlacksAreBeautiful]

why did it stop going? what is that called?

[Cavestach]

Friction.

XD Also it hit the wall. :3

[cloudftw93]

@Cavestach lol everyone here fails, inertia is the spread of mass from an axis of rotation, and the force that keeps it going is (although not EXACTLY a force) torque not friction.

[MrMillsms]

@cloudftw93 We are not discussing moment of inertia here

[Reid52]

@cloudftw93 once his hand is taken off there is no longer any torque being applied, however. isn't this just newton's first law put into rotational terms? i don't understand the confusion

[jaeceesta]

@Cavestach nice one...

[aussienerds]

@Cavestach Friction is not the reason it keeps going, if anything friction is what stops it's motion.