Answer:
Absolutely nothing. Unless you're superstitious.
Explanation:
Black cats crossing your path are infamously believed to bring around bad luck, but that comes down to what you believe. There is no scientific evidence whatsoever that this is the case, therefore, it is completely your opinion.
I can't help if i don't see no phrases.
Answer:
inertia is a property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
An unbalanced force is an unopposed force that causes a change in motion