# Mechanics in Physics: Classical vs Quantum Mechanics

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## 11 Questions

### What is the key principle in quantum mechanics that states particles exhibit properties of both particles and waves?

Wave-Particle Duality

### According to quantum mechanics, what principle states it is impossible to know both the exact position and velocity of a particle simultaneously?

Uncertainty Principle

Superposition

Entanglement

### Which domain benefits from applications of quantum mechanics such as lasers, transistors, and quantum computers?

Information Technology

### Which branch of physics deals with matter subjected to forces or displacements?

Classical mechanics

### What type of objects does classical mechanics primarily focus on?

Large objects on Earth or in space

### According to Newton's laws of motion, what happens to a body in the absence of an external force?

It remains in its state of rest or uniform motion

### What does the Law of Universal Gravitation describe?

The force of gravity between all particles in the universe

### In classical mechanics, what do the Three Laws of Motion describe?

The relationship between force and motion

### Which branch of mechanics is concerned with nature at the smallest scales like atoms and subatomic particles?

Quantum mechanics

## Mechanics in Physics

Mechanics is the branch of physics concerned with the behavior of matter subjected to forces or displacements, as described by Newtonian mechanics. It is divided into classical mechanics for large objects on Earth or in space, and quantum mechanics for tiny particles. Classical mechanics deals with the motion of bodies under the influence of forces and provides equations governing accelerations and trajectories. Quantum mechanics, on the other hand, describes nature at the smallest scales, such as molecules, atoms, and subatomic particles.

### Classical Mechanics

Classical mechanics is based on Sir Isaac Newton's laws of motion, which describe the relationship between the force acting upon an object and its resulting motion. These laws include:

1. Law of Universal Gravitation (Law of Force of Gravity): Every particle in the universe attracts every other particle with a force acting along the line intersecting both particles.
2. Three Laws of Motion: These laws state that a body remains in its state of rest or uniform motion unless acted upon by a force; the change in momentum of a body is directly proportional to the force applied; and forces act equally but opposite on interacting bodies.

#### Laws of Motion in Action

These laws are illustrated in everyday phenomena, such as the behavior of planets orbiting the sun, projectiles flying through the air, and pendulum swings. They also predict the motion of objects in space, such as satellites and spaceships.

### Quantum Mechanics

Quantum mechanics is a complex field that deals with the behavior of particles at extremely small scales, where classical physics fails to explain observed phenomena. Key principles of quantum mechanics include:

1. Wave-Particle Duality: Particles exhibit properties of both particles and waves.
2. Uncertainty Principle: It is impossible to know both the exact position and velocity of a particle simultaneously.
3. Superposition: A system can exist in multiple states at once, until measured or observed.
4. Entanglement: Two particles become linked so that measuring the state of one instantaneously affects the state of the other, regardless of distance.

Quantum mechanics finds applications in various domains, from lasers and transistors to modern technologies like quantum computers and cryptography.

Explore the fundamental principles of classical mechanics based on Sir Isaac Newton's laws of motion, and contrast them with the intricate realm of quantum mechanics dealing with particle behavior at the smallest scales. Learn about forces, trajectories, wave-particle duality, uncertainty principle, superposition, and entanglement.

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