BJU Physical Science Chapter 6c

efficiency

For a machine or process, the ratio of energy or work
produced to the energy or work present beforehand; a measure of the effectiveness of the machine or process for converting energy from one form
to another. (p. 140)

conservation of energy

Law stating that the total amount of energy
entering the process equals the total of all the forms of energy that exist at the end of the process. Also known as the first law of thermodynamics. (p. 142)

first law of thermodynamics

Law stating that energy and matter cannot be created or destroyed, only changed in form. See also conservation of energy. (p. 142)

elastic collision

A collision between two objects in which the
momentums and kinetic energies of the colliding objects are conserved. (p. 143)

partially elastic collision

A collision between two objects in which
momentum is conserved but some of their kinetic energies is lost to other forms of energy during the collision. The objects are slightly deformed but
rebound. (p. 143)

inelastic collision

A collision between two objects in which the
deformation is so severe that they stick together. While total momentum is conserved, total kinetic energy is greatly reduced by the amount of energy required to deform the objects. (p. 143)