Winner Science
Churn, Learn & Earn
Wave motion characteristics
Jun 13th
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: More >
Difference periodic motion, oscillatory motion and simple harmonic motion
Jun 7th
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.
Period of Motion: More >
Derive relation F = ma from Newton 2nd Law of Motion
Jun 6th
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: More >
Types of Inertia
Jun 5th
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. More >
What are Newton’s Laws of motion
Jun 4th
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. More >
Force, inertia and linear momentum
Jun 3rd
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. More >
3 important properties of nucleus
May 22nd
Some of the important properties of atomic nucleus are given below :
(a) Nuclear charge : The charge on the nucleus is due to protons contained in it. The charge on each proton is + 1.6 x 10-19 coulomb which is equal in magnitude to thecharge of an electron. Taking the charge of a proton as one unit, the total charge on the nucleus is numerically equal to the numberof protons. For example, a hydrogen nucleus (i.e., proton) carries a single unit charge. More >
How full wave rectifier operates
May 17th
Let us discuss today the operation of full wave rectifier:
In the full wave rectifier, two PN junction Diodes (say D1 and D2) a connected in the circuit. A load resistance (RL) is connected in the circuit across which the output is taken.
Let at any instant S1 is positive and S2 is negative. the diode (D1) is forward biased and diode (D2) is reversed biased so D1 will conduct but D2 will not. More >
Parts of nucleus
Apr 30th
NUCLEAR CONSTITUENTS
It is a known fact that from the scattering of α – particles, scientist Rutherford concluded that the atom of any element consists of central core called nucleus and electrons moving around it. The entire mass of the atom and positive charge is concentrated inside the nucleus. The nucleus is supposed to consist of two particles, the proton and the neutron. Their masses are nearly the same as : More >
Half wave rectifier operation
Apr 29th
Rectifier:
A rectifier is a device that converts alternating current into direct current.
Half wave rectifier:
In this rectifier, the PN junction diode is connected to an input AC supply with the help of a primary coil, which will induce an emf in the secondary coil and ultimately the output is taken across the load resistance (RL).
Let at any instant S1 is positive and S2 is negative. Due to this polarity the junction diode is forward biased so it will start conducting and output is obtained. More >