a level maths help

lee_miller7

a bit lost mate

Reply 1

lee_miller7

Original post by lee_miller7

a bit lost mate

here's the question

Reply 2

davros

Original post by lee_miller7

here's the question

This may help :smile:

https://www.thestudentroom.co.uk/showthread.php?t=7349238

Reply 3

lee_miller7

Original post by davros

This may help :smile:

https://www.thestudentroom.co.uk/showthread.php?t=7349238

yeah this didn't help

Reply 4

davros

Original post by lee_miller7

yeah this didn't help

Given that that post actually includes the MS, you'll need to post some working of your own, or explain where you're stuck so that someone can help you further :smile:

Reply 5

lee_miller7

Original post by davros

Given that that post actually includes the MS, you'll need to post some working of your own, or explain where you're stuck so that someone can help you further :smile:

this is the answer^
but i don't understand why they are using friction when taking moments when F is not perpendicular to the rod

Reply 6

mqb2766

Original post by lee_miller7

this is the answer^
but i don't understand why they are using friction when taking moments when F is not perpendicular to the rod

None of the 3 forces (weight, reaction, friction) are normal to the rod. Each moment is calculated by
force * perpendicular distance
or
perpendicular force * distance
or
force * distance * sin(angle between them)

(edited 11 months ago)