Is a
that
motion
between two objects
that
each other. as the wind blows, it touches
earth's
. as molecules in the air mass come into
contact with the
friction occurs. this friction
acts to
the speed of the wind. friction can also
be caused by
such as mountains. additionally,
buildings and houses can also slow down the wind because
of friction. friction explains why wind travels
across an open field than it does across a town with
on every street.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

answer carbon and three oxygen atoms;