In the real world, machines are never 100% efficient. There is always loss of energy, usually due to friction.
By contrast, in physics problems, an "ideal machine" is a hypothetical device which is perfectly efficient. The assumption of perfect efficiency allows the problem to focus on the fundamental mechanical principles.
Yes! mostly in the form of heat and noise (think of a car engine)
Carin and machines
a real image can be projected
Yes. Real images can be projected onto a screen.
not 100% sure, but i ges yes. only in ideal models can friction be eliminated but in real world, the frictional factor is not likely to be totally reduced to none i think
They always eventually break.
machines that may be used to solve real-world problems
are time machines real
true
Yes
its true
true
i believe ghost are real and there is a paranormal world.
true
True
true
true