## What is Physics Used For?

Physics is a subject that deals with natural phenomena. It is a practical, mathematical, and experimental subject with loads of logic.

Everything we study around the world, be it applications of Newton’s laws, in applications of quantum mechanics, or talk about examples for projectile motion, an example of circular motion, vector physics examples, scalar quantity examples, etc. We find the multiple applications of Physics in daily life.

On this page, we will understand the role of physics in our daily life with Physics examples.

### Importance of Physics in Daily Life

Talking about the significance of Physics in our daily life, we will talk about the following Physics in our daily life examples:

Types of motion with examples in physics

Scalar quantity examples

Vector Physics Examples

Newton's second law of motion example

Centripetal force examples

Example of non-uniform acceleration

Example of a derived quantity

Projectile motion examples

Zeroth law of thermodynamics examples

Coulomb's law example

Now, we will understand the uses of Physics:

### Uses of Physics

Types of Motion With Examples

Whenever there is movement or change in position of an object or body we say that the body is in motion.

Example: Moving train, flying airplane, etc.

We can classify motion into various types:

1. Rectilinear Motion: When an object possesses a linear path it is said to have a rectilinear motion.

Example: a person walking on a straight road, a train moving inside a straight tunnel.

2. Circular Motion: When the distance (radius) of the object from a fixed point remains constant, it possesses circular motion.

Example: A boy enjoying a rotary swing, a moving fan.

3. Periodic Motion: When an object moves to and fro about a fixed point or the mean position, it possesses periodic motion.

Example: moving pendulum, class timetable, multiplication tables (2 times table, each multiple initiates from 2).

4. Projectile Motion - A body making a locus of the parabola is said to be in a projectile motion.

A few projectile motion examples are:

A gun recoiled from the top of the mountain

Passing ball games between two girls

Volleyball game

A basketball player throwing the ball in the basket

A trajectory of a fired cannonball

A football kicked by a man

Scalar Quantity Examples

A physical quantity that can be measured or have a magnitude but doesn’t point to direction is said to be scalar by nature.

For example, we can measure mass, distance, the weight of a man on the moon, speed but cannot determine their direction.

Vectors Physics Examples

A quantity that can be measured numerically and we can determine its direction is said to be a vector.

For example, we can determine the displacement of the object with the direction an object takes.

Newton’s Laws of Motion Examples

Now, we will understand the applications of Newton's laws:

First law: It is the law of inertia, which states that the body remains at rest or in uniform motion. Some examples of the first law of motion are:

A needle of the wall clock continues to complete its cycle and the moment, the cells are taken out, the needles continue to remain at rest.

An employee continues to work on the project allotted by her manager until the manager (force) asks (pushes) him to do another task.

Second law: Whenever a body of mass ‘m’ undergoes a change in momentum with a changing time under the influence of the applied force, it is said to have the equation in the following form:

F = mdP/dt = ma

Newton’s second law of motion example: During winters, we push our car to move it forward, as soon as it gains momentum, it starts moving with an acceleration ‘a.’

Third law: Here, we can consider examples for frictional force:

For example, a man trying to move on a floor elevator (moving forward) is pushed backwards because of the friction and the equal and the opposite force acting on his feet.

Centripetal force examples

Spinning a cricket ball

Twirling a lasso

Coulomb’s Law Example

One of the best examples of Coulomb’s law is the electrostatic force of attraction between protons and electrons in an atom.

### Application of Physics

Zeroth law of thermodynamics examples

Let’s suppose that two bodies are in contact with each other and are kept inside an adiabatic boundary, the wall between the two bodies is adiabatic as well.

Consider two vessels P and Q filled with fluid. Let P, V, T for vessel P and Q be Pa, Va, Ta, and Pb, Vb, Tb, respectively.

In an adiabatic process, no heat transfer takes place, i.e., in thermal equilibrium even if the temperatures T1 and T2 are different.

Application of Quantum Mechanics

The quantum mechanical model of an atom was proposed by an Austrian Physicist named Erwin Schrödinger, according to his theory, electrons have some matter waves.

Quantum mechanics find formulation in terms of operators, probabilities, matrices, momentum, wavelength quantities, and in terms of energy.

For the properties at a macroscopic scale-like force, there is very little treatment, so we study it in the following applications:

Wave-particle duality

Compton effect

Photoelectric effect

Moseley’s law

Planck’s radiation law

1. What are Some Proposed Ideas of Quantum Mechanics?

Ans: Some of the proposed ideas of quantum mechanics are:

Louis de Broglie proposed that a matter has some particles, and some are matter waves with a wavelength λ, given by the following equation:

λ = h/mv

As per the Heisenberg uncertainty, the more we know the position of an electron, the less we can determine its energy and vice versa.

Electrons have an intrinsic property called spin that can either be one of the two possible spin values: spin-up or spin-down.

If two electrons are present in the same orbital in an atom, they must have opposite spins.

2. State Three Laws of Thermodynamics.

Ans: **First Law of Thermodynamics**

This law states that when we apply the law of conservation of energy to a system, the energy transfer in that system occurs away/nearby the system with the help of heat and work.

From this law, we can manipulate the relationship between the change in the internal energy of the system, the work is done by the system, and also by the heat supplied to it.

**Second Law of Thermodynamics**

From this Law of thermodynamics, we obtain that it is impossible to find a system in which the absorption of heat from the reservoir totally converts into work.

**Third Law of Thermodynamics **

The third law of thermodynamics states that the system holds minimum energy at an absolute zero temperature.