Manual gear question

If you dropped the revs, yes.

But if you downshift and keep the revs up (for example after downshift your revs double from 1500 to 3000) that puts you into the power and, rather than being out of it and trying to accelerate into it

yes and no, because at higher rpms you are making more HP = more speed

Let's say that you are in 5th gear at 90 km/hr at 2000 rpm, and you want to overtake a car in front so you shift down to 4th gear and the rpms will go from 2000 to 3000 or 3500 depending on gear ratios, and when you shift down it will decrease your speed at 80 km/hr but you'll be able to overtake faster in 4th than in 5th

>Am I being baited? I cant tell, Im drunk.
What's your drink of choice tonight sir?

I guess what I was saying is that I've been driving manual for 11 years and I still can't technically explain to a noob what's going on. I just kind of accept that "this" happens when I do "that" haha.

Not quite, he'll burn or waste more fuel if he stays in the higher gear to accelerate, so if he's in heavy traffic that's not maintaining a set speed its better to stay in a lower gear.

>My father says that I should not go on lower spins because it will hurt the engine.
This is false

>The faster it spins the faster you burn gas.
This is true

This has nothing to do with your (lack of) understanding of the physics of a manual gearbox. It has everything to do with your teaching skillss

>it can burn more fuel, meaning it can make more power
This is false

Doing 40 in 5th burns less fuel than doing 40 in 4th gear
So there's an equal amount of power but a different amount of fuel usage

Yes.

But you should get there quickly. Most fuel consumption comes from throttle position rather than engine speed. Staying in a lower gear as you build speed is more efficient. You should only change to your cruising gears relative to your speed once you reach it.