as2curry:
Badges: 8
Rep:
?
#1
Report Thread starter 4 months ago
#1
A uniform rod is balanced horizontally about a support F. Forces of 400 N and 100 N act at the ends of the rod, as shown.
Image
What is the reaction force acting on the rod at support F?
Sum of anti clock wise moments = sum clockwise moments I tried using this but my answer comes out as 533N and the mark scheme says 600N I have tired making two equations from either point but can't get the answer
Last edited by as2curry:; 4 months ago
0
reply
username3477548
Badges: 20
Rep:
?
#2
Report 4 months ago
#2
What have you done so far
0
reply
as2curry:
Badges: 8
Rep:
?
#3
Report Thread starter 4 months ago
#3
(Original post by Qxi.xli)
What have you done so far
tried taking moments from either end of the beam and solving for Rf but still not right
0
reply
username3477548
Badges: 20
Rep:
?
#4
Report 4 months ago
#4
(Original post by as2curry:)
A uniform rod is balanced horizontally about a support F. Forces of 400 N and 100 N act at the ends of the rod, as shown.
Image
What is the reaction force acting on the rod at support F?
Sum of anti clock wise moments = sum clockwise moments I tried using this but my answer comes out as 533N and the mark scheme says 600N I have tired making two equations from either point but can't get the answer
Does the question state the weight of the rod?
0
reply
as2curry:
Badges: 8
Rep:
?
#5
Report Thread starter 4 months ago
#5
(Original post by Qxi.xli)
Does the question state the weight of the rod?
No it does not just says its a uniform rod
0
reply
username3477548
Badges: 20
Rep:
?
#6
Report 4 months ago
#6
(Original post by as2curry:)
No it does not just says its a uniform rod
Hmm
What exactly is your equation for anticlockwise=clockwise? x
0
reply
as2curry:
Badges: 8
Rep:
?
#7
Report Thread starter 4 months ago
#7
Yeah sum of anti clockwise = clockwise
0
reply
Muttley79
Badges: 20
Rep:
?
#8
Report 4 months ago
#8
(Original post by as2curry:)
Yeah sum of anti clockwise = clockwise
Post your working and the full question
1
reply
as2curry:
Badges: 8
Rep:
?
#9
Report Thread starter 4 months ago
#9
(Original post by Muttley79)
Post your working and the full question
Name:  Untitled.png
Views: 38
Size:  26.6 KB
0
reply
Muttley79
Badges: 20
Rep:
?
#10
Report 4 months ago
#10
(Original post by as2curry:)
Name:  Untitled.png
Views: 38
Size:  26.6 KB
Your working?
0
reply
as2curry:
Badges: 8
Rep:
?
#11
Report Thread starter 4 months ago
#11
(Original post by Muttley79)
Your working?
Cant really upload my working but could you explain what you would do if that is possible
Don't have my book with me
Last edited by as2curry:; 4 months ago
0
reply
Muttley79
Badges: 20
Rep:
?
#12
Report 4 months ago
#12
(Original post by as2curry:)
Cant really upload my working but could you explain what you would do if that is possible
I took moments about both ends.

Type or photo your work
0
reply
as2curry:
Badges: 8
Rep:
?
#13
Report Thread starter 4 months ago
#13
(Original post by Muttley79)
I took moments about both ends.

Type or photo your wo
f+300 = FD
3f+400 = FD
0
reply
username3477548
Badges: 20
Rep:
?
#14
Report 4 months ago
#14
(Original post by Muttley79)
I took moments about both ends.

Type or photo your work
Lol now I'm confused about the question too😭
Is the reaction force an anticlockwise or clockwise moment?

(Original post by as2curry:)
f+300 = FD
3f+400 = FD
Is the answer A
Last edited by username3477548; 4 months ago
0
reply
Muttley79
Badges: 20
Rep:
?
#15
Report 4 months ago
#15
(Original post by as2curry:)
f+300 = FD
3f+400 = FD
Moments about left end? Sorry what is FD? You can take moments about the centre too.
0
reply
as2curry:
Badges: 8
Rep:
?
#16
Report Thread starter 4 months ago
#16
(Original post by Qxi.xli)
Lol now I'm confused about the question too😭
Is the reaction force an anticlockwise or clockwise moment?


Is the answer A
Mark Scheme says D 600n
0
reply
as2curry:
Badges: 8
Rep:
?
#17
Report Thread starter 4 months ago
#17
(Original post by Muttley79)
Moments about left end? Sorry what is FD? You can take moments about the centre too.
What was your working out when you did it through the centre?
0
reply
Muttley79
Badges: 20
Rep:
?
#18
Report 4 months ago
#18
(Original post by as2curry:)
What was your working out when you did it through the centre?
We can't post solutions - please just explain what you posted and I'll give you a hint to correct it
0
reply
Muttley79
Badges: 20
Rep:
?
#19
Report 4 months ago
#19
(Original post by as2curry:)
Mark Scheme says D 600n
Yea I got that
0
reply
as2curry:
Badges: 8
Rep:
?
#20
Report Thread starter 4 months ago
#20
(Original post by Muttley79)
Yea I got that
did you take moments from F?
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

How are you feeling now you've started university?

I'm loving it! (57)
14.65%
I'm enjoying it but I'm still settling in (98)
25.19%
I'm a bit unsure (67)
17.22%
I'm finding things difficult (133)
34.19%
Something else (let us know in the thread!) (34)
8.74%

Watched Threads

View All