AS Physics - Help with moments question
Hey guys, hoping you can help me with this question on moments. I'm struggling to understand the whole principle right now.
Link to the paper: http://www.ocr.org.uk/images/58048-question-paper-unit-g481-mechanics.pdf
Would post the Q here, but contains diagrams.
Anyway, it's question (6)(a)(ii).
(6)(c)(ii) also gave me a bit of trouble, but I think I figured it out with a little help from the mark scheme.
Thanks for any help
Link to the paper: http://www.ocr.org.uk/images/58048-question-paper-unit-g481-mechanics.pdf
Would post the Q here, but contains diagrams.
Anyway, it's question (6)(a)(ii).
(6)(c)(ii) also gave me a bit of trouble, but I think I figured it out with a little help from the mark scheme.
Thanks for any help
Moment = force x perpendicular distance
Anticlockwise moments are positive, clockwise ones are negative.
Total moment = Sum of anticlockwise and clockwise moments.
Also: anticlockwise 4N force, perpendicular distance is x
clockwise 4N force, perpendicular distance is (x + 3.0cm)
Anticlockwise moments are positive, clockwise ones are negative.
Total moment = Sum of anticlockwise and clockwise moments.
Also: anticlockwise 4N force, perpendicular distance is x
clockwise 4N force, perpendicular distance is (x + 3.0cm)
Okay thanks guys Probably should have put a bit of work down.
1)
So, the clockwise moment would be: 4.0 x (0.03 + x)
And the anticlockwise moment would be: 4x
Right?
So do we add these together to find the total moment?
Probably should have put a bit of work down.1)
So, the clockwise moment would be: 4.0 x (0.03 + x)
And the anticlockwise moment would be: 4x
Right?
So do we add these together to find the total moment?
Oh wait, if you meant clockwise moments are positive, then I think I've got it.
Clockwise = 4 x (0.03 + x) = 0.12 + 4x
Therefore, total moment = 0.12 + 4x - 4x which equals 0.12.
Significance being it is the same value as the torque!
Clockwise = 4 x (0.03 + x) = 0.12 + 4x
Therefore, total moment = 0.12 + 4x - 4x which equals 0.12.
Significance being it is the same value as the torque!
Original post by NoNamedUser
Oh wait, if you meant clockwise moments are positive, then I think I've got it.
Clockwise = 4 x (0.03 + x) = 0.12 + 4x
Therefore, total moment = 0.12 + 4x - 4x which equals 0.12.
Significance being it is the same value as the torque!
Clockwise = 4 x (0.03 + x) = 0.12 + 4x
Therefore, total moment = 0.12 + 4x - 4x which equals 0.12.
Significance being it is the same value as the torque!
correct
the moment of a couple is equal to the force times the perpendicular distance
so the solution is
Moment=Fd
= 4x(3x10^-2)
= 0.12Nm
so the solution is
Moment=Fd
= 4x(3x10^-2)
= 0.12Nm
Original post by NoNamedUser
Oh wait, if you meant clockwise moments are positive, then I think I've got it.
Clockwise = 4 x (0.03 + x) = 0.12 + 4x
Therefore, total moment = 0.12 + 4x - 4x which equals 0.12.
Significance being it is the same value as the torque!
Clockwise = 4 x (0.03 + x) = 0.12 + 4x
Therefore, total moment = 0.12 + 4x - 4x which equals 0.12.
Significance being it is the same value as the torque!
Indeed correct.
Thanks guys
Quick Reply
Related discussions
- GCSE Exam Discussions 2024
- Physical
- Physics question moments
- Urgent Isaac physics help !!
- Physical
- Advice for applying for physics undergrad
- revision
- Physics - i need a miracle
- Mathematics Of Mechanics (yay)
- A Level Maths Moments question
- Why is tension not equal to weight in moments questions?
- Year 10 science
- cognito for science
- GCSE Physics Study Group 2023-2024
- A-level Further Maths Study Group 2023-2024
- Engineering A levels vs Btec
- Audiology at Aston University
- Need help on deciding a major, Physics or EEE?
- Rotational dynamics (A level physics) question
- physics during gap year help!!
