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# M2 elasticity equestrian Watch

1. http://filestore.aqa.org.uk/subjects...B-QP-JUN13.PDF

9.c

Ok so, via the mark scheme, it is saying, that when B is at rest, the frictional force on A + weight of B + tension acting on B = initial E.P.E?

but where is 2.04 from in the MS? http://filestore.aqa.org.uk/subjects...W-MS-JUN13.PDF

I am a little confused.
2. (Original post by Bobjim12)
http://filestore.aqa.org.uk/subjects...B-QP-JUN13.PDF

9.c

Ok so, via the mark scheme, it is saying, that when B is at rest, the frictional force on A + weight of B + tension acting on B = initial E.P.E?

but where is 2.04 from in the MS? http://filestore.aqa.org.uk/subjects...W-MS-JUN13.PDF

I am a little confused.
The extension in the spring was 2.5, from the first part, remember? Hence, when B is at rest, the extension is 2.5 - 0.46 - x where x is the distance B moves upwards.
3. (Original post by Zacken)
The extension in the spring was 2.5, from the first part, remember? Hence, when B is at rest, the extension is 2.5 - 0.46 - x where x is the distance B moves upwards.
Ah, that is correct. Thankyou.
4. (Original post by Bobjim12)
Ah, that is correct. Thankyou.
You're welcome.

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