How does mechanics describe the effects of forces on objects?

In physical science, mechanics is the study of how forces affect the motion of bodies, including the state of static equilibrium where a body remains at rest.12

Mechanics describes these effects primarily through Newton’s laws of motion, which establish the relationship between force, mass, and motion:13

• The Law of Inertia: An object at rest or in uniform motion remains in that state unless acted upon by an external force.32
• The Law of Force: A net force applied to an object causes it to accelerate. This is expressed as $F=ma$, where force is proportional to the rate of change of momentum.34
• The Law of Action and Reaction: When two bodies interact, they exert forces on each other that are equal in magnitude and opposite in direction.32

Mechanics also accounts for forces that cause deformation or resist motion, such as friction. By analyzing these interactions, mechanics allows scientists to predict the future motion of systems or understand the forces required to maintain balance.4512