Wednesday, May 26, 2010

Examples of Kinetic Energy

As we understood what is all about kinetic Energy in the previous lesson, let me also go through on Examples of kinetic Energy. This will help you not only on examples but also kinetic energy and temperature.
Kinetic energy:
Kinetic energy produced by a body due to its motion is called kinetic energy. The kinetic energy is equal to one half the product of mass and square of velocity of the body
Temperature:
One of the thermodynamic energy is temperature. It is related to average energy of motion
Examples of Kinetic Energy:

I would like to list down all the examples of Kinetic Energy. All moving objects have kinetic energy. Keeping this point in mind we can illustrate some examples of kinetic energy

1. A moving car
2. Water falling from a height in waterfalls
3. Electrons revolving around the nucleus
4. Earth orbiting the sun
5. A swinging pendulum
6. Satellites revolving around the planets
7. A walking man
8. A moving rocket or spacecraft
9. A bullet fired from a gun
10. A child playing a computer game
11. A spinning top
12. Water stored in the dam has potential energy.When it flows down the Potential energy gets converted into Kinetic energy.
13. A rocket fired from the launch vehicle.
14. A person skipping
15. A police running behind a thief
16. Mangoes falling from a mango tree
17. A diver undergoing sky diving
18. A person swimming
19. A crawling baby
20. A bucket of water undergoing vertical or horizontal motion

In short any example of motion you consider, it has kinetic energy associated with it.

I hope i took your time in a productive way. keep reading .... May in the next lesson let me help you understand on Momentum and kinetic energy.

What is Kinetic Energy

Introduction of Kinetic Energy -
Kinetic energy is a form of energy which is related to the motion of the particle.If a body is at rest then its kinetic energy will be zeroinetic energy is a form of energy which is related to the motion of the particle.If a body is at rest then its kinetic energy will be zero.

What is Kinetic energy:
I would also like to post an example on what is Kinetic Energy. Consider a body of mass 'm' moving with a velocity 'v'. The kinetic energy associated with the particle is given by
KE = 1/2mv2
Types of Kinetic Energy-
Following are the types of Kinetic energies
1. Translational kinetic energy - possessed by a body undergoing straight line motion
2. Rotational kinetic energy - possessed by rotating objects
Have you come to an conclusion on what is all about Kinetic Energy. I would also like to share my thoughts with you on Examples of Kinetic Energy. Keep reading and leave your comments to help me help you better.........

Sunday, May 23, 2010

Physics in relation to Science, Society and Technology

Physics is always in relation to People, Society and technology. The relation between physics, technology and society can be seen in many examples. The discipline of thermodynamics arose from the need to understand and improve the working of heat engines. The steam engine, as we know, is inseparable from the Industrial Revolution in England in the eighteenth century, which had great impact on the course of human civilization. Sometimes technology gives rise to new physics; at other times physics generates new technology. An example of the latter is the wireless communication technology that followed the discovery of the basic laws of electricity and magnetism in the nineteenth century. The applications of physics are not always easy to foresee.

Below are the few examples of some physicists from different countries of the world and their major contribution
Physics is the study of nature and natural phenomena. Physicists try to discover the rules
that are operating in nature, on the basis of observations, experimentation and analysis.
Physics deals with certain basic rules/laws governing the natural world. What is the nature of physical laws? We shall now discuss the nature of fundamental forces and the laws that
govern the diverse phenomena of the physical world.

Scope and Excitement of Physics

In this lesson lets try to learn more on what is all about Physics and its scope and excitement of Physics.

What is Physics?
The word Physics comes from a Greek word meaning nature. Its Sanskrit equivalent is Bhautiki that is used to refer to the study of the physical world. A precise definition of this discipline is neither possible nor necessary. We can broadly describe physics as a study of the basic laws of nature and their manifestation in different natural phenomena.

The scope of physics is described briefly in the next section. Here we remark on two principal thrusts in physics : unification and reduction.

Scope and Excitement of Physics.
We can get some idea of the scope of physics by looking at its various sub-disciplines. Basically,
there are two domains of interest : macroscopic and microscopic. The macroscopic domain
includes phenomena at the laboratory, terrestrial and astronomical scales. The microscopic domain includes atomic, molecular and nuclear phenomena*.
Physics is exciting in many ways. To some people the excitement comes from the elegance and
universality of its basic theories, from the fact that a few basic concepts and laws can explain
phenomena covering a large range of magnitude of physical quantities.

In the following lessons lets try to learn Physics in relation to Science, Society and technology.



Friday, May 21, 2010

Huygens Principle

In this lesson lets try to examine on Huygens Principle. Before we start lets try to know
" What is Huygens Principle?"
Huygens’ Principle (HP) contains both the principle of action-at-proximity and the superposition principle of waves . Although the propagation of sharp, non-spreading wave fronts is included in Huygens’ original formulation, it can be left out without touching those principles

We would first define a wavefront along with the wave theory : when we drop a small stone on a calmpool of water, waves spread out from the point of impact. Every point on
the surface starts oscillating with time.

If we have a point source emitting waves uniformly in all directions,
then the locus of points which have the same amplitude and vibrate in
the same phase are spheres and we have what is known as a spherical
wave as shown in Fig. At a large distance from the source, a small portion of the sphere can be considered as a plane and we have
what is known as a plane wave

Now, if we know the shape of the wavefront at t = 0, then Huygens
principle allows us to determine the shape of the wavefront at a later
time τ. Thus, Huygens principle is essentially a geometrical construction, which given the shape of the wavefront at any time allows us to determine the shape of the wavefront at a later time. Let us consider a diverging wave and let F1F2 represent a portion of the spherical wavefront at t = 0

Thursday, June 25, 2009

How does mirror equation works

Topic:- mirror equation

Ray diagrams can be used to determine the image location, size, orientation and type of image formed of objects when placed at a given location in front of a mirror.
The reflection of light is what we are getting here.

Let us see one example on it .

Question:-
An object is 15 cm from a spherical concave mirror having a 20 cm radius. Locate the image by means of: the mirror equation?

ANSWER: - 30 cm

The mirror equation expresses the quantitative relationship between the object distance (do), the image distance (di), and the focal length (f). The equation is stated as follows:

1/ do +1/f = 1/ di

f=-r/2= - 20/2=-10 cm

So here di = - 30 cm

Here the image is – 30 cm from the mirror

Friday, June 5, 2009

Question on Wavelength of Sound generated by a String

Waves and Sounds is one of the basic concept in Physics which deals with wavelength, frequency and velocity of waves and sounds under uniform motion.

Topic : Velocity and Wavelength of Sound

Waves travel under uniform motion in sinosoidal form. However velocity of waves will be calculated using same formula v = s/t where s is the distance between two crests of wave denoted by λ.

Question : The velocity of waves on a string is 92 m/s. If the frequency of standing waves is 475 Hz, how far apart are two adjacent nodes?

Solution :
The distance between two adjacent nodes is the half of wavelength.
Therefore:
λ = v/f
= 92/475
= 0.2m

Therefore: d = λ/2 = 0.1 m

For more simple word problem like this contact physics help or science help.