Question

Imagine you are holding an apple. Does this apple have energy?how do you know?

Answer 1

Yes, the apple has energy.

The apple has energy as a result of it position above the earth surface, it is called potential energy.

You know this by releasing the apple from your hand and you see the apple start falling to the earth.

The potential energy is converted to kinetic energy.

Answer 2

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.