>>12388370ok, Ill try to help here.
first of all, when a car accelerates or decelerates, the fly will also be affected. flying or sitting, doesnt matter.
when the car drives with a constant speed, the fly will not be affected, same as a human sitting in the car(newton: like in a resting system). the fly can fly withount any influence.
but when the car drives around a corner with that constant speed, the change of direction will also result in a acceleration, again for both human and fly(and everything else of course).
F=m*a (F:Force, m:masse, a:acceleration/deceleration)
when the mass of an object is small scale, the force of an acceleration will also be of a small scale.
this is at first irrelevant, because the fly is also small.
but the scale of the fly plays a role for forces acting on it.
for example during the constant speed cornering.
while the fly threatens to drift out of its flight, there is still the force, which is caused by the viscosity of the air, which the fly has to overcome.
the crosswise drift of the fly thus also generates a force.
it is not a very strong force, but the force due to cornering, is not very strong either.
the difference between fly and man lies here in the ratio of these forces, because they do not have to be the same at all.
this is not easy to imagine. here is a better example:
a drop of water hangs from a water tap. drop-shaped, because of a force ratio of surface tension and weight of the drop.
something like this is only possible on the scale of a fly, because surface tension cannot have arbitrary large values (maximum about 100mN/m). you will never see an outlet at a dam where a 2 meter drop is hanging.
the physics of the fly is therefore the same as that which we experience, but given force ratios differ.
another example is why an ant can fall from a skycraper and not die.
the maximum speed of falling is lower due to the force ratios but also the ratios on impact (strength of chitin sheath and momentum) differ.
