The apple in my hand has three different forms of energy
that I can think of.
1). Thermal energy. I know that the apple's temperature is
not absolute zero, because it is not freezing my hand off.
Therefore it holds some heat energy.
2). Chemical energy. From previous experience, I know that
if I eat the apple, it gives me a boost and keeps the doctor away,
since my body is able to metabolize it, and extract nutrition from
its chemical energy.
3). Potential energy. Also from previous experience, I realize
that when I picked up the apple, I exerted force on it opposite to
the force of gravity. By doing work on it, I endowed it with increased
gravitational potential energy, which would immediately be obvious
if I dropped it to the ground, where it would either smash or dig a
little crater in the grass.
