Do particles move slower when you remove energy?

Answer 1

-- If the energy of the particle is its kinetic energy, then removing kinetic energy

certainly slows it down.

-- If the energy of the particle is its heat energy, then that too is nothing more than

the kinetic energy of its molecules. Remove heat energy from it, and the average

kinetic energy of its molecules ... along with their average speed ... decreases.

-- If an object started out high above the ground and then fell to the ground, it

gains speed constantly while it's falling. This is not a counterexample of losing

energy, since the falling object doesn't lose any energy ... it just trades potential

for kinetic. So it doesn't belong in this discussion at all.

Answer 2

Yes, particles generally move slower when you remove energy from a system because energy is often associated with the motion of particles. As energy is reduced, the kinetic energy of the particles decreases, resulting in slower movement.

Answer 3

They may, or they may not. Instead of removing kinetic energy (which would make the particles slower), you can also remove potential energy (which would not make them slower).