Re: Further maths forces help desperately needed

really hard question which i dont understand anything about please help

P=0 is your usual particle on a slope question. First thing you want to do is label the weight and resolve it parallel/perpendicular to the slope. It is in equilibrium therefore you need to use the fact that the frictional force, $\mu R$, is the greater than or equal to the force dragging it down, which is the weight component parallel to the slope.

Second part is straight-forward with the P being resolved parallel/perpendicular - you should be able to do this. Then the second part of this question just asks you to calculate moments about the bottom-right corner of the box in Figure 2.

For third part, you need to use the fact that the overall moment is 0 about the same point.

P=0 is your usual particle on a slope question. First thing you want to do is label the weight and resolve it parallel/perpendicular to the slope. It is in equilibrium therefore you need to use the fact that the frictional force, $\mu R$, is the greater than or equal to the force dragging it down, which is the weight component parallel to the slope.

Second part is straight-forward with the P being resolved parallel/perpendicular - you should be able to do this. Then the second part of this question just asks you to calculate moments about the bottom-right corner of the box in Figure 2.

For third part, you need to use the fact that the overall moment is 0 about the same point.