M2 Statics Question

This question is confusing me, I've tried the method of joining the lines of action but I end up with " 2.5mg = 4tan(ø) x F " , which obviously doesn't lead to F = 25/32mg. I've looked at the solution bank and understand how they've done it, but I don't understand why the way I'm doing it is giving me the wrong answer :frown:

Any help would be greatly appreciated :h:

Reply 1

TeeEm

19

Original post by d14m

This question is confusing me, I've tried the method of joining the lines of action but I end up with " 2.5mg = 4tan(ø) x F " , which obviously doesn't lead to F = 25/32mg. I've looked at the solution bank and understand how they've done it, but I don't understand why the way I'm doing it is giving me the wrong answer :frown:

Any help would be greatly appreciated :h:

it will be better if you post a photo of your workings

Reply 2

TeeEm

19

Original post by d14m

ImageUploadedByStudent Room1457136144.311565.jpg

Posted from TSR Mobile

I will be signing off now but I will tag one of the best of the room

@Zacken

Reply 3

d14m

OP

2

Original post by TeeEm

it will be better if you post a photo of your workings

I thought the solution was something along these lines :confused:

Reply 4

AlmostNotable

12

Original post by d14m

This question is confusing me, I've tried the method of joining the lines of action but I end up with " 2.5mg = 4tan(ø) x F " , which obviously doesn't lead to F = 25/32mg. I've looked at the solution bank and understand how they've done it, but I don't understand why the way I'm doing it is giving me the wrong answer :frown:

Any help would be greatly appreciated :h:

Where did you find this question? I got F=25mg/72.

Reply 5

d14m

OP

2

Original post by AlmostNotable

Where did you find this question? I got F=25mg/72.

It's in the M2 edexcel textbook, mixed exercise 5E

Posted from TSR Mobile

Reply 6

d14m

OP

2

Question 5 IIRC

Posted from TSR Mobile

Reply 7

drandy76

13

Original post by d14m

This question is confusing me, I've tried the method of joining the lines of action but I end up with " 2.5mg = 4tan(ø) x F " , which obviously doesn't lead to F = 25/32mg. I've looked at the solution bank and understand how they've done it, but I don't understand why the way I'm doing it is giving me the wrong answer :frown:

Any help would be greatly appreciated :h:

Have you tried resolving and taking moments instead of a geometrical approach?

Posted from TSR Mobile

Reply 8

AlmostNotable

12

Original post by d14m

It's in the M2 edexcel textbook, mixed exercise 5E

Posted from TSR Mobile

Book is wrong. It is 25mg/72.

Reply 9

d14m

OP

2

Oh wow, thanks for your help. I can't tell you how long I spent trying to figure out where I went wrong. Any other mistakes in statics?

Posted from TSR Mobile

Reply 10

Ayman!

15

Original post by d14m

Oh wow, thanks for your help. I can't tell you how long I spent trying to figure out where I went wrong. Any other mistakes in statics?

Posted from TSR Mobile

Quite a few if I recall. The M2 book is riddle with mistakes. Here's a PDF that might help you.