If a system is isolated, then the total energy of the system.... a. constantly i

Question

If a system is isolated, then the total energy of the system....
a. constantly increases.
b. depends on the work going out of the system.
c. is constant in time.
d. constantly decreases.
e. depends on the work going into the system.

Can Kinetic Energy ever be negative?
a. No, if an object is moving, that takes some amount of energy, which must be positive.
b. Yes, because Work can be negative, so the Kinetic Energy can be negative as well.
c. Yes, if the velocity is negative then the kinetic energy would be negative.
d. No, because Work can never be negative, so the Kinetic energy can't every be negative.

Explanation / Answer

1.

c. is constant in time

2.

a. No, if an object is moving, that takes some amount of energy, which must be positive

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