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Edexcel M1 Mechanics ... Did You Learn Tilting (in Moments)??

1

The specifications say

"Simple problems involving coplanar forces acting on a body and conditions for equilibrium in such conditions."

I only know about moments with equilibrium....i cant remember if we did tilting in class or not...so if you're doing m1 edexcel mechanices, did you learn about tilting (in moments)?

Reply 1

Mohit_C

10

As far as I know, it's only in M2.

Reply 2

Guitarman5

There is a bit in M1 for it, pg 140

It's just an inbalance of forces I think, which causes it to tilt.

Reply 3

fblade

14

I think for Edexcel, we have to work it out when its on the verge of tilting.

Reply 4

generalebriety

16

What? I do Edexcel, and I got taught tilting in M3. You do need to know about moments and conditions for equilibrium, but you won't be asked to find when things are on the verge of tilting.

Reply 5

Coolraj

5

Actually, you need to know that Friction is maximum at the point of tilting for M1. This is when the formula F_r =muR. Thats all I can remember on this...
EDIT: I must admit that I never really applied this in M1. But I guess its useful to remember it...

Reply 6

generalebriety

16

Coolraj

Actually, you need to know that Friction is maximum at the point of tilting for M1. This is when the formula F_r =muR. Thats all I can remember on this...
EDIT: I must admit that I never really applied this in M1. But I guess its useful to remember it...

But that's not sufficient for tilting. Friction is maximum when you're in motion too. "Sliding and toppling" is definitely an M3 topic, when you do centres of mass properly. :smile:

Reply 7

Coolraj

5

generalebriety

But that's not sufficient for tilting. Friction is maximum when you're in motion too. "Sliding and toppling" is definitely an M3 topic, when you do centres of mass properly. :smile:

True

I wonder why I left the bit on the friction being maximum when its in mortion out... but the point is that when the object is on the point of tilting (and when its in mortion), the friction is maximum. This is when you can use the formula F = muR.

Reply 8

chidona

15

buj

The specifications say

"Simple problems involving coplanar forces acting on a body and conditions for equilibrium in such conditions."

I only know about moments with equilibrium....i cant remember if we did tilting in class or not...so if you're doing m1 edexcel mechanices, did you learn about tilting (in moments)?

I don't believe that quote actuallt mentions tilting, it just says 'condtions for equilibirum', which is that the sum of the clockwise moments must equal the sum of the anticlockwise moments.

But the only time that tilting comes up in the exam will be when you've got a rod resting on two supports, and then something happens and the rod is on the point of tilting about one of the supports. You're then expected to know that the resultant force between rod and the other support is 0.

Reply 9

Swayum

18

I agree with chidona. One of the last things the Heinemann M1 book talks about is when the reaction at one of the supports is 0.

Reply 10

prash_s90

16

chidona

I don't believe that quote actuallt mentions tilting, it just says 'condtions for equilibirum', which is that the sum of the clockwise moments must equal the sum of the anticlockwise moments.

But the only time that tilting comes up in the exam will be when you've got a rod resting on two supports, and then something happens and the rod is on the point of tilting about one of the supports. You're then expected to know that the resultant force between rod and the other support is 0.

yep hes right

Reply 11

gorilla_baby

9

the previous posts in this thread are true -
you only need to know about rods on the verge of tilting about one of the pivods supporting it, therefore, the pivot that the rod doesn't tilt about will have an upwards support force of zero newtons and only the pivot that the rod tilts about will have an upwards force
hope that made sense though-and good luck in your exams :smile:

Edexcel M1 Mechanics ... Did You Learn Tilting (in Moments)??

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