I get the conservation of momentum law that states that objects always have conserved momentum. I can easily accept this with the view that while an object appears to be at rest it is actually speeding through the universe at a massive speed. I just have the same speed so relative to myself the object is "not moving". A problem arises when I try to visualize the 'straight lines' part. It is impossible for something to move in a straight line. No matter how I visualize it, this straight line motion does not match my world and it drives me crazy sometimes. Anyway, picture an object moving in a 'straight line' on earth. It can't, because earth is rotating. So go to the pole and chuck something up in a 'straight line'. It's not straight because the earth is orbiting. What isn't orbiting? the earth is orbiting it own center of gravity if we think about it. Everything has conserved angular momentum, everything must curve. The only place I can envision a straight line is through the 'axis' of the universe if it has one. However, the thought of approaching the axis of the universe evokes images of massive speeds due to the 'centripetal force' of moving closer to the axis of rotation from a point moving outwards. I have always been fascinated by physics but I have always been scared of the maths. I struggle to find relation between mathmatical operations and my world. Time/motion, how does this relate? Why is physics defined as the study of matter and energy and not time? What does addition and multiplication actually represent in terms of motion? I'm trying to learn the maths but I get sucked into forgetting the distinction between maths and physics. How does something like an exponent manage to represent acceleration? Is the energy equation a mathmatical concept that just fits or is that equation actually what energy is and if so how is it justified? I think too deeply about the fundamental stuff that the maths eludes me because I fail to make the connections in an intuitive way. Anyway, made some claims that are likely false but I figure being proved wrong is a great way to learn.