Based on the law of conservation of energy, which statement is false?
a. energy is lost when machines don't work right.
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b. we can't add more energy to the universe.
c. we can't destroy energy that exists in the universe.
d. energy changes from one form to another.

From the conservation of energy...

We can say that the total energy contained in the universe must be constant. No energy can be added or removed without that change being balanced out by an energy gain/loss elsewhere. This makes choices B and C true.

To balance out these changes in energy, it must change forms (like a planet orbiting a star exchanges some of its potential energy for kinetic energy and vice versa). This makes choice D true.

By process of elimination, the answer is choice A.

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.