Kinetics pulley example problem (Atwood machine)

[@rollmarz]

You are my savior. I'm going to ace my test tomorrow thanks to this.

[@Engineer4Free]

I hope it went well! 🙌

[@leila4208]

thank you so much, my teacher didn't explain that well so I didn't understand, but you explained it very simply!

[@Engineer4Free]

You're welcome! I'm glad it helped =)

[@dingdonghereicome23]

Because of you I got full score on my physics retake 🙌🙌

[@coolmonkey619]

If only you were my lecturer

[@Engineer4Free]

Me too. At least I can help you here though!! 🤜🤛

[@zulu_kondwani]

Why is weight (w2) on m2 positive???

[@severussnapeytp715]

imagine the string is strung out in a straight line. The acceleration will be pointing in the same direction

[@michaelschipper7277]

to make the calculations easer you change the m2 direction to + down

[@canibotlin8302]

Because we took the downward direction to be positive, so the weight force time will be considered positive because its direction is also downwards. However, in the first diagram, we took upwards to be positive and weight was downwards therefore we considered it negative. I hope this helps.

[@ShowaChuma]

Thank you 😊

[@nawarthenawarthe269]

pro saved my life

[@X4ve]

Thank you so much!!!!!!!

[@tonyhill2318]

I'm very confused by what's going on with the signs of the numbers

[@JasmineAfshar]

Why is the tension the same for both masses? Is the tension always the same in these problems?

[@notlandqn]

because its the same string

[@neild7971]

in a very simple version of this, 10kg on either side, stationary, the tension in the cable is near equal to 10kg/98N? not 20kg/196N? how is this possible? does no point in the cable experience 20kg?196N

[@dankninja9434]

Pretty sure in this situation the pin connecting the cable to the wall would experience 196N worth of force, while the cable tension equals 98N. U could prove this by drawing an FBD about the two masses and then one about the pulley itself. While the pulley experiences 2 downward forces of C, the masses themselves each experience 1 upward force of C.

[@plaseaud]

i don't get the 28kg part, where did that come from?

[@kraken6161]

he just grouped 11kg a and 17kg a and added them together

[@shanarobinson7672]

Youre amazing

[@Engineer4Free]

Thanks Shana 😊

[@santiagoksc]

Thank you

[@MarianneForte]

same as a= (m2-m1/m1+m2)g

[@JuliaKelly-b3p]

Reinhold Hill

[@WesleyBarton-b5d]

Parker Union

[@AsaMoeser-h3n]

Benjamin Valleys