Hi everybody. I have started with the M1 Mechanics Course this term and my teacher gave me some exam questions to do over the half term break but now I am stuck on one of the questions and I hope someone here will be able to help me. So here is the question: (read l as lamda and m as mue) A force F2 = (l i + m j ) acts on a particle. Show that 2l - m + 1 = 0. Given that the direction of F2 is parallel to j I have started to think about this problem and came up with (l + m) = (0+1) x constant l = 0 x constant. m = 1 x constant. But this does not really help me at all. and i can't think about much else to do so I am very happy over every hint you can offer me. Thanks in advance. Ancient.