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| the meeting of particles or of bodies in which each exerts a force upon the other, causing the exchange of energy or momentum |
| a unit of energy, the work done by a force of one newton when its point of application moves through a distance of one meter in the direction of the force |
| rest mass | |
| —n | |
| the mass of an object that is at rest relative to an observer. It is the mass used in Newtonian mechanics | |
rest mass n.
The physical mass of a body when it is regarded as being at rest.
| rest mass
In Special and General Relativity, the observed mass of a body that is not in motion with respect to the observer. Also called invariant mass. Compare relativistic mass. |