Recent content by Phenomniverse

As I understand it, the effect of gravity is greatly diminished over long distances. Even so, the mass of the moon is sufficient to exert an influence on earth, for example on tides. My question is, to what extent does the mass of the Earth influence gravity on the moon. Gravity on the moon...

I don't know what 'do an integral' means. Sounds like a skateboard trick of some sort.

Ok that's the critical information that I was missing. So if the force is changing you need to calculate the sum of all the forces and multiply that by the sum of all the displacements produced by those forces? How does this relate to the explanation in terms of dot products and cross...

Ok well I'm still far from being 100% clear on any of this but I appreciate your attempts to illuminate me. I'm new to studying physics and obviously struggling to grasp basic concepts. Perhaps I'll eventually gather enough knowledge to understand the rationale behind those concepts. Thanks...

What is a conservative field?

Can you explain this in the context of my example of walking across the room and back? Is the displacement zero, or isn't it? Is it realistic to talk about work in this example, or does the (apparent) zero quantity of displacement mean there is zero work performed?

Again, I'm not sure why this means that displacement should be treated as a scalar when calculating work. Please clarify this for me if you can.

Work = force x displacement, so if there is zero displacement, the work is zero, right? But if I get up and walk across the room and walk back again to my starting place, the net displacement is zero, however I am told that there is still work performed. The explanation given for this is that...

I'm studying biomechanics and have joined this forum in the hope of clarifying some points that have thus far eluded me. I look forward to learning from you all.