2023 Mechanical Systems Exam (NCEA Level 3 Physics)

[@asmc1492]

For 3a and 3b why do we equate the graph to the shm formula given that the graph labels are for linear acceleration and velocity instead of angular in the equation?

[@noahs7211]

Hey Mr Whibbley the links in the description dont work just letting you know

[@MrWhibleyPhysics]

Thanks Noah, all fixed.

[@tree_stump123]

for questions 3c could we use the y=Acoswt equation instead of the reference circle?

[@MrWhibleyPhysics]

You certainly could.

[@RuwinduTennakoonDassanayakeMud]

Thanks Mr Whibbley

[@RLPCYARN]

My physics exam is tomorrow, goodluck to me :(

[@MrWhibleyPhysics]

Good luck!

[@RLPCYARN]

@@MrWhibleyPhysicsthx, wish me luck I'm going to do it in the next hour :D

[@user-ht9ll6xg5z]

@@RLPCYARN haha same xD

[@mrkrabbes1233]

for question 3c, i thought phasors go anti clockwise, so shouldn't your diagram be mirrored on the right? thanks

[@MrWhibleyPhysics]

Correct! The standard convention is that phasors rotate counterclockwise, much like how it's standard convention to make downwards pointing vectors negative.
Doing it the other way the physics still works perfectly fine, as it does here, though if I were to redo this I'd stick with convention and go counterclockwise. My brain must have been a bit back to front at the time of recording.

[@mrkrabbes1233]

Thanks for the reply!
Very helpful

[@ishaan7004]

Love the video ❤ very helpful 🎉 first!!!!!!!!!!

[@MrWhibleyPhysics]

Thanks Ishaan.

[@markdaria5477]

@@MrWhibleyPhysics No problem.