the heavier a thing is and the faster it moves,the more kinetic energy it possesses.In a similar way,light and slow-moving objects have less kinetic energy.
Warmth and coldness involve the motion of the particles of matter.
Since they are always moving, the particles of matter possess a form
of energy called kinetic energy. All moving objects, large and small,
possess kinetic energy (Figure 1). Flying airplanes, the fl apping wings
of a bird, and invisible vibrating particles all possess kinetic energy
All of the particles in a substance are attracted to each other.
So, why do the particles not stick together and stop moving? Particles
have a lot of kinetic energy, which keeps them moving. When the
environment gets colder, they slow down and come closer together.
Th ey never slow down enough to come to a complete standstill.
If you could see the particles of an object, you would notice that
they are not all moving at the same speed. Particles of matter collide
with each other much like bumper boats in an amusement park ride.
Bumper boats collide randomly as they move from place to place
(Figure 2). Sometimes, several boats collide in such a way that some
slow down and some speed up. Particles of matter also move and
collide randomly, some speeding up and some slowing down. Particles
do not all possess the same amount of kinetic energy at any given
time. Some particles have more kinetic energy than others.
Temperature
If you could see the particles of a hot object and the particles of a
cold object, you would see that most of the particles of the hot object
move faster than most of the particles of the cold object. Th us, the
average kinetic energy of the particles of a hot object is higher than
the average kinetic energy of the particles of a cold object.
Temperature is a measure of the average kinetic energy of particles.
If most of the particles of air in your kitchen are moving faster than
most of the particles of air in your bedroom, then the temperature of
the air in your kitchen is higher than that of the air in your bedroom.