A 1000 N crate is being pushed across a level floor at a constant speed by a force F of 300 N at an

A 1000 N crate is being pushed across a level floor at a constant speed by a force F of 300 N at an angle of 20.0° below the horizontal, as shown in the Figure a. (a) What is the coefficient of kinetic friction between the crate and the floor? (b) If the 300-N force is instead pulling the block at an angle of 20.0° above the horizontal, as shown in Figure b, what will be the acceleration of the crate? Assume that the coefficient of friction is the same as that found in part (a).

[lanyssa]

with taking a 5 weeks physics class that got changed last minute to an online zoom class, this channel has definitely helped me immensely.

[laplanetesauvage]

The way you explain it helps me understand physics better. Thank you!

[kpopisthebestful]

All you videos are soo freaking helpful. Thanks so

[Shadow.wolf]

Thanks for making this video! You helped me figure out how to solve one of the problems on my Physics homework that I was stuck on! So thanks for that and keep up the great work! ^^

[emilyzhang]

this was extremely helpful for my Physics WebAssign. Thank you!

[danisha]

Hello, i really appreciate the videos you have posted, i am having a hard time comprehending the components part, how do you know which side to assign cos and which side sin, i know in basic trig x axis represents cos and y axis represents sin, but i realize in physics its a little different i am not sure, i would greatly appreciate an explanation.

[jaredhall]

Thank you for the video! I'm confused about how to know when to use sin vs cos for the different angles. Could anyone give some insight? Thanks!

[Ceecee]

Why is Fx = 0 in first part and Fx=ma in 2nd part?
push vs pull: both are an acceleration in x-direction??

[ethanl]

this is so helpful thank you so much!!

[mariecurie]

Can l ask? the problem is stated below the horizontal so its not -20° ?

[maybinchola]

Sir. When finding the normal force which is mg why were you not multiplying it by 9.8m/s2 as the gravity unlike taking 1000N direct???

[valentinamontero]

Can someone explain how Fcos20 is pointing to the right?? Like how do we know that?

[Ohfelious]

at 7:00 why do you use the Y normal force of 897N with the X coeff of kin friction (0.256)? Why do you use both axees if the acceleration is in the X axis? Why split f_k into mu times normal force in the first place?

[aokosakano]

why is it F x cos20 instead of mg x cos20? how will i know the difference?

[hehersonpapagayo]

can someone please enlighten me? What I learned was if velocity is constant acceleration is zero however, if speed is constant it doesn't mean that acceleration is zero. Is it right or wrong?

[nooreennisrina]

i have a questionn> how should we know where to draw the components?

[balaportejean]

is the seond part accelerating just because it's not said "constant speed"?

[aokosakano]

basically, why is it F x cos20 in some cases and mg x cos20 in others?

[juliatrillo]

at 1.48 minutes— why is the x component Fcos(20) instead of Fsin(20)?

[agent_orca]

where do Fcos20 and fsin20 come from? this question makes no sense to me and it's only my second day in physics