What happens to the total mechanical energy of a system if friction is involved?

Answer 1

No. Kinetic energy is the energy of something moving.

***

Friction is a force opposite the direction of movement due to the rubbing of surfaces in contact. This rubbing causes heat energy which is usually dissipated into the surroundings and is therefore unavailable to do further work. Heat energy is an increase in the kinetic energy of the molecules BUT again, friction is a force NOT energy.

Answer 2

YES. Kinetic energy is the energy a body possesses because of it is in motion. Because it exists between an object and the surface over which it moves.

Actually, NO. Friction is a force. In mechanical systems it is equal to the product of the coefficient of friction (mostly determined by material type and surface finish/roughness) and the force normal to the surface interface. A friction force can exist in the absence of motion (static friction) which disqualifies it as a form of kinetic energy, but it also exists between surfaces that are in motion relative to each other (dynamic friction). In the case of dynamic friction, it is still a force, but when applied over a distance, the force will produce heat (friction work) which is the energy lost to friction.

Answer 3

When friction between particles increases, the viscosity increases, and particles slow down, so the movement slows down, because particle surfaces are rubbing against each other, which eventually causes them to slow down.

Particles get tired too :)

Just like when we rub our hands, eventually we stop too :)

Unless you are superman...Maybe he is an exception :)

Answer 4

if friction is interfering with the amount of the kinetic energy, depending on the amount of friction, kinetic energy is changed to some physical factors, like sound and heat mainly.

Answer 5

If there is friction, the total energy will remain constant; on the other hand, the total mechanical energy will decrease over time.

Answer 6

Most of it becomes heat energy, some causes surface wear and damage.