Mechanics
Mechanics is the branch of physics that studies the motion of objects and the forces that cause or affect their motion.
Branches of Mechanics
- Kinematics — describes motion without considering its causes.
- Dynamics — studies motion and the forces causing it.
- Kinetics — studies forces causing the motion
- Statics — studies objects in equilibrium, where there is no acceleration
Difference between Kinetics and Dynamics
||Kinetics|Dynamics| |—|—|—| |Meaning|Studies forces/torques and their effects on motion|Studies motion and its causes| |Main question|What causes the motion?|How does motion occur, and what causes it?| |Deals with|Force, torque, mass, acceleration|Motion + force| |Example|Finding the force required to accelerate a 5 kg5,kg body|Studying the body's motion under applied forces|
Types of Mechanics
→ Classical Mechanics
→ Quantum Mechanics
→ Relativistic Mechanics
→ Statistical Mechanics
→ Continuum Mechanics
→ Celestial Mechanics
| Type | What it studies | Typical situation |
|---|---|---|
| Classical Mechanics | Motion of macroscopic objects at ordinary speeds | Cars, projectiles, planets |
| Quantum Mechanics | Behavior of matter and energy at atomic/subatomic scales | Electrons, atoms, photons |
| Relativistic Mechanics | Motion when speeds are comparable to the speed of light or gravity is very strong | High-speed particles, black holes |
| Statistical Mechanics | Behavior of systems containing a very large number of particles using probability and statistics | Gases, liquids, solids |
| Continuum Mechanics | Mechanics of materials treated as continuous matter | Fluids, elastic solids |
| Celestial Mechanics | Motion of astronomical bodies under gravitational interactions | Planets, moons, satellites |
