Physics 4.7 Friction & Forces at Angles (1 of 8) Horizontal Surface: 1

In this video I will find maximum force=? pushed at 30 degrees on to a 5kg box on a horizontal surface with a static friction of 0.4 before the box starts moving.
(Bloopers at the first :30 seconds)

Next video in this series can be found at:

[ryzurrin]

6 years later and this video is still simply amazing!

[conorfinn]

this guy is singlehandedly saving my AP physics grade

[nicholasparks]

This is the first video I have watched. I've been tearing my hair out on a question for the last 4 hours. And you just helped me solve it in 6 minutes. I am now subscribed.

Thank you.

[olizelda]

Haha, is the beginning a blooper reel? Even professors have fun sometimes!

[aeradv]

That intro was great. (I mean, honestly, all your videos are great in general...!)

[nick_davila]

Graduated with a degree in Computational Physics and still come here for the basics when I need help. Thank you sm :')

[HoneyBMellow]

Thank you soo much, only video that helped me with my homework and it's 2023!!

[Ben-sxxb]

I was going to say "this guy is a god".. i look in the comments and somone already said it lol

[sanjeevansanjee]

The coefficient of friction between ground and ground is 0. Is 1. 15 kg is the value of the force f if the offender receives 3ms ^ -2 armature when the f key is applied to the offender.(fcos 30, f sin 30)

[asyw]

I'm from Iraq and I'm a student in electrical engineering and I'm watching your videos now because I have an exam in physics, thank you very much

[eggxecution]

I was stressed stuying this but watching the video somehow reminded me not to overthink and enjoy the ride thanks for the vid ❤

[Structure-Dubai]

hi boss, the friction force also depends on contact area between the object and the surface beneath it... contact area increase, the friction force magnitude will also increase.

[lillycrochet]

Thank you so much! Your explanations are amazing and easy to understand :)

[vikashkumargupta]

This concept is very helpful thank sir 👍

[eyesontheprize]

Great video...quick question though, why use the angle 30 and not 330 since your resolved vertical force should be negative. ( The force itself kind of is in the 4th quadrant.)

[Paul-qqcf]

What if velocity is unknown and you have mass force angle and distance?

[steffenleo]

Good Day Prof Biezen, if a field with less gravity does it also mean less friction? Or other word expressed bearing on the moon with less gravity than earth will last longer in lifetime?
Have a nice weekend... 👍👍

[icebreaker]

Hello sir I have a question.
A 4.00 kg block is at rest on a horizontal surface, acted on by a 6.97 N horizontal force. The coefficients of static and kinetic friction are 0.795 and 0.158.



Moments after the horizontal force is applied, the magnitude of the force of static friction acting on the block, in N and to two decimal places, is



(If there is no static friction acting on the block, enter an answer of "0" with the appropriate number of decimal places.)

[sreelakshmi]

Sir, can you explain how we do the same problem but, when applied force and mass is given to find the angle of friction ?

[hamzaforce]

Watching this in class in silent mode and wondering why the lecturer id laughing his ass off🤔😂