conceptual physics Calculating friction forces

[Heidispy]

He said it was at a constant speed, since acceleration is a change in speed or direction, he is correct. Seems like some people should worry more about their textbook than what the teacher is wearing.

[jpmorgan187]

this guy is obviously a child molester.  just look at his jeans and that fanny pack.

[CrimsonSoul777]

Chuck Norris is teachin' the asian kids!!

[TheTechDude09]

@CrimsonSoul777 LOL at the beginning I thought you were being racist...then i saw that you were right.

[Calqulate]

Obviously, if there is no acceleration, that must mean that the Force of Friction is equal to the applied force.

In this case, Fa = 3N, furthermore, the Ff must equal 3N, considering acc is 0.

[zzzbambamzzz]

at 0:09 he says: "I'm going to pull it, so it has no acceleration". Pay attention. Maybe you should be one of his students and take notes ;).

[BiLLYinatreee]

@zzzbambamzzz No that's correct. In order to calculate frictional force you need a constant velocity, with >no< acceleration. BAMMM B)

[MustangGTR2]

@zzzbambamzzz hehe so according to your logic an object that moves is always accelerating ?

[DonQuichotteLiberia]

He said there was no acceleration, I agree about the kindergarden though. If you're doing real mechanics it can be quite a struggle :-D

[keanoscarermitano619]

What is he trying to say here? No acceleration is equal to 3 neutons?

[soothsayer61]

Zero net force means no acceleration. It's a reference to Newton's second law: Force = mass * acceleration. If there's no net force, then there's no acceleration. The 3 newtons in the one direction cancels out the 3 in the other direction, thus 0 net force.

[Gamnash4]

@soothsayer61 Oh, and you think your so sma--... well actually, that was nicely said.

[Argoon1981]

No, he said friction equals the force that you are pulling the object (with no acceleration) so friction is 3 newtons.