Why are lubricants necessary? decrease loss of energy
reduce friction
used as fuel
increase heat energy

reduce friction

Explanation:

Lubricants are needed to reduce the friction between two bodies in contact with one another.

Frictional force is a force that opposes the motion of a body. As a body moves forward, friction acts in an opposite direction.

Lubricants are used to reduce and remove frictionUnfortunately, without friction, motion cannot be controlled.Lubricants only reduces friction between two bodies. As friction reduces, a body moves more readily and easily.

Ijust took the quiz. their is no coefficient needed. : )

Ahigh energy (high speed) particle (alpha or beta or neutron) are shot at the target;