## Wave motion characteristics

What is a Wave Motion:

Wave Motion is a form of disturbance which travels through a medium due to repeated periodic motion of the particles of the medium about their mean positions. The motion being handed on from one particle to the next.

Characteristics or properties of wave motion: Continue reading “Wave motion characteristics”

## Difference periodic motion, oscillatory motion and simple harmonic motion

Let us discuss the meaning or definition of periodic motion, oscillatory motion, simple harmonic motion and difference among them:

Periodic Motion:

The motion which repeats itself over and over again after equal intervals of time is known as periodic motion.

Example of periodic motion: Motion of planets around sun motion of earth above its own axis.

## Derive relation F = ma from Newton 2nd Law of Motion

Let us derive the relation of force F = ma from Newton’s second law:

According to the Newton’s 2nd Law of motion, the rate of change of linear momentum of a body is directly proportional to the applied external force and in the direction of force.

It means that the linear momentum will change faster when a bigger force is applied.

Consider a body of mass ‘m’ moving with velocity v.

The linear momentum of a body is given by: Continue reading “Derive relation F = ma from Newton 2nd Law of Motion”

## Types of Inertia

There are basically three types of Inertia-:

(a) Inertia of Rest: The inability of a body to change by itself its state of rest is known as Inertia of Rest.

Examples:

(i) Person sitting in a car falls backwards, when the car suddenly starts. It is because the lower portion in contact with the car comes in motion where as the upper part tries to remain at rest due to inertia of rest.

(ii) When we shake the branch of a tree, the leave or the fruits falls down because the branches comes in motion  where as the leaves or the fruit tends to remain at rest and hence gets detached. Continue reading “Types of Inertia”

## What are Newton’s Laws of motion

The following are the Newton’s laws of motion :

Newton’s I Law: A body continues to in its state of rest or of uniform motion along a straight line unless an external force is applied on it.

Show that Newton’s 1st Law of Motion defines force?

According to the law of motion, a body continues to be in its state of rest or of uniform along a straight line unless it is acted upon by an external force.

So, we define force in the form of a push or pull which may change or tends to change the state of rest or of uniform motion of a body.

Newton’s II Law: The rate of change of linear momentum of the body is directly proportional to the external force applied on the body and this change takes place in the direction of the applied force.

Discuss the consequences of Newton’s 2nd Law of Motion. Continue reading “What are Newton’s Laws of motion”

## Force, inertia and linear momentum

Force: The pull or push which change or tends to change the state of rest or of uniform motion or direction of motion of an object is called Force.

The units and dimension of force:

We know that                                  F = ma

There are two types of units of force

(i) Absolute Units:

(a) In M.K.S or S.I unit, the absolute unit of force is Newton (N)

Where                                                    1N = 1kg ´ 1m/s2

So 1N is the force which produces an acceleration of 1m/s2 in a body of mass 1 kg. Continue reading “Force, inertia and linear momentum”