Recent content by Physiophysio

So...in a steep dive, the plane's weight is larger than lift, so there is a resultant force downwards so it accelerates downwards. The same cannot be said of the people inside the plane, which is why people feel weightless because the seat they are sitting on is not in contact with them as it is...

That is true: I mean, if [G(m1)(m2)]/(r^2), is equal to force exerted by one mass on another, then my mass and that of the person next to me is rather tiny, and as G is a very, very small number, the final outcome of that equation is very tiny...so much so that friction and the Earth's...

Ah...you feel it because of the force produced from the ground you are standing on or the seat you are sitting on. But in a steep dive, the plane and you are both accelerating downwards, but in such a way that you are not accelerating down faster than the plane, (so equal to its acceleration or...

Homework Statement (NB: posted earlier, but didn't agree with PF policy, so reposting as requested; apologies). When a plane is in a steep dive, people say they feel ''weightless''. Do they in reality? Explain your answer. What do they actually mean by ''weightless''? Homework Equations W=mg...

Could you please explain why that is, because, yes, I see how a=5 which is g/2, but how does that come about? Is it because, in free fall with no air resistance and only the weight, a=g, but now air resistance is half of weight, so a would be a/2 which is equal to g/2? Or is that logic wrong...

Thanks :)

Homework Statement Assume a ping pong of mass 3g is falling, and it has fallen 1m and is now traveling at 5 m/s. If the air resistance force is half its weight, how far will it travel in the next 0.1 seconds. [Hint: you may want to sketch a velocity-time graph) Homework Equations Understanding...