Imagine you are holding an apple. a. Does this apple have energy? How do you know? b. How could you increase the potential energy of this apple? c. How could you increase the kinetic energy of this apple?

A). The apple has thermal energy, because its temperature is higher

than absolute zero.

It also has chemical energy, because if I eat it, I get a burst of energy

and I become ambitious for a while.

It also has gravitational potential energy, because if I drop it on my foot,

it could bruise one of my piggies.

b). I could increase its potential energy by lifting it higher, like over my head.

c). As long as I'm just holding the apple, it doesn't have any kinetic energy.

I could give it some kinetic energy by throwing it.

Or I could just drop it, and let gravity give it kinetic energy.