M2 Moments question help
http://puu.sh/65Qsv.png
The question is on the link above (or the pic below). In the mark scheme they took moments about A and I understand how they did it but I don't get why I'm wrong. Thanks
The question is on the link above (or the pic below). In the mark scheme they took moments about A and I understand how they did it but I don't get why I'm wrong. Thanks
Original post by `God
http://puu.sh/65Qsv.png
The question is on the link above (or the pic below). In the mark scheme they took moments about A and I understand how they did it but I don't get why I'm wrong. Thanks
The question is on the link above (or the pic below). In the mark scheme they took moments about A and I understand how they did it but I don't get why I'm wrong. Thanks
After a quick glance, where's friction in your first equation when you took moments about G?
2a*R1cos(alpha)=a*R2sin(alpha)
EDIT: I've just done the question by taking moments about . You've forgotten to consider the turning effect (moment) of the friction at .
(edited 10 years ago)
Original post by `God
http://puu.sh/65Qsv.png
The question is on the link above (or the pic below). In the mark scheme they took moments about A and I understand how they did it but I don't get why I'm wrong. Thanks
The question is on the link above (or the pic below). In the mark scheme they took moments about A and I understand how they did it but I don't get why I'm wrong. Thanks
You appear to have ignored Fr when taking moments
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