1. the branch of mechanics that deals with the motion of objects and the forces that cause motion
Usage: physics; used with singular verb
2. the study of the rates of chemical reactions and the factors that affect them
Usage: chemistry; used with singular verb

Examples

• The physics course covered both statics and kinetics.
• Kinetics helps engineers understand how forces affect moving objects.
• The professor explained the kinetics of the chemical reaction.
• Temperature greatly influences reaction kinetics.
• Students studied kinetics to predict how fast the reaction would occur.
• The kinetics of enzyme reactions are complex and temperature-dependent.