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Attraction, Gravitation and some doubts

“In universal law of gravitaion what is  the word “attraction” actually refers to?
I am already on the earth surface and attached to it.Then what is the meaning that earth still attacting me accounts for.
Does that mean earth want me to attarct me towards its center point (ie.., into the inner core of the earth’s interior).
Please answer I am puzzled and worried about my analysis.

Explain with reasons…”


Asked Gopi Krishna




Earth's Core


Yes, Earth continues to attract you until you reach its centre.


Every body attracts all other objects towards its centre, not to its surface!


Space Time

First, I am a physics ‘hobbyist’; I have only rudimentary (read college classes) in physics and I absolutely recognize that I know very little about the subject except what I have studied and can find online.  However, I have a theory that the flow of time causes space in much the same way that the flow of electricity causes magnetism (the ‘right hand thumb rule’, for example).  This would explain the supposed curvature of space since it would flow in a circular motion nn degrees against the flow of time.  This idea could explain, in a way, the faster-than-light expansion of space nanoseconds after ‘The Big Bang’ since it wasn’t space that exploded but rather time that exploded meaning time ‘flowed faster’ immediately after the big bang causing a massive, near instantaneous expansion of space at that time.  (As you can see, I have far too much ‘time’ on my hands…)  The problem I have – and hope someone can answer – is that I can think of no way to prove or disprove this experimentally; not so much my ancillary thoughts of time and the big bang but rather if time causes space, how can this be disproved or proved experimentally?


Asked Kenneth R. Guilstorf






askphysicslogoAccording to the theory of relativity, the length will decrease to zero.

Please refer to ther following links for more information on the question.

  1. http://en.wikipedia.org/wiki/Length_contraction
  2. http://io9.com/5527521/what-happens-if-youre-traveling-at-the-speed-of-light-and-turn-on-your-headlights
  3. http://wiki.answers.com/Q/What_happens_when_you_travel_at_the_speed_of_light
  4. http://www.physics.org/interact/time-twins/special-relativity.html
  5. http://www.physlink.com/education/askexperts/ae169.cfm
Time dilation in transversal motion. The requi...
Time dilation in transversal motion. The requirement that the speed of light is constant in every inertial reference frame leads to the theory of relativity (Photo credit: Wikipedia)

Gravity and Galileo

How Galileo gave acceleration due to gravity before Newton discovered gravity . exactly what happen
Asked Nikhil

Colorized engraving after Enoch Seeman's 1726 ...

Newton stated the Universal Law of gravitation and explained why objects fall to earth when dropped.

But objects were falling even before Newton explained it.

The concept of speed and velocity was known before the Law of Gravitation was formulated.

Photoelectric effect


I wanted to to know that why the attraction of electrons towards the positive plate of the the CRT is not taken into account in the Einstein’s explanation of the photoelectric effect and only the velocity imparted by the striking photon is considered.


English: German-born theoretical physicist Alb...



Amit Singh


I request you to kindly read the story well. Every aspect is dealt in detail. Please go thoroughly through the text material or the link to photoelectric effect provided in this page.



How is quantum simultaneity compatible with relativity?

When an entangled particle “collapses”, physics says that the other particle collapses simultaneously.

But that’s non compatible with relativity, which says that simultaneity depends on the place and velocity of the observer.


Events A, B, and C occur in different order de...
Events A, B, and C occur in different order depending on the motion of the observer. The white line represents a plane of simultaneity being moved from the past to the future. (Photo credit: Wikipedia)


So the question is:
– How can quantum disentanglement simultaneity be compatible with relativity? Do the entanglement state is dependent on the observer, in the mean that a pair of particles can be entangled for one observer and collapsed to other?
– What experiments fundament the answer? Is the answer only theoretical?


Asked Marraco


Awaiting response from visitors



Some Physicists and their contributions

Physicists outside India


  • Galileo – (formulated the basic law of falling bodies, constructed a telescope and discovered four moons revolving around Jupiter)

    Picture of Isaac Newton, Galileo Galilei and A...
    Picture of Isaac Newton, Galileo Galilei and Albert Einstein
  • Archimedes: Archimedes Principle and theory of floatation, Principle of levers)
  • Albert Einstein: Theory of relativity, (Special and General)
  • Isaac Newton: Laws of motion, The method of Calculus
  • Michael Faraday: Electromagnetic induction, dynamo


Physicists from India


    • CV Raman – (studied light scattering and discovered the Raman effect)
    • JC Bose – (pioneered the investigation of radio and microwave optics)
    • SN Bose –English: Satyendra Nath Bose in Paris 1925

      (worked out statistical method of handling bosons)

    • MN Saha – (best known for his development of the Saha equation, used to describe chemical and physical conditions in stars.)
    • HJ Bhabha (initiated nuclear research programs in India; carried out experiments in cosmic rays; calculated cross section for elastic electron-positron scattering)
    • Subramanyan Chandrasekhar:-Subrahmanyan Chandrasekhar in his later years

      (won the 1983 Nobel Prize for Physics for key discoveries that led to the currently accepted theory on the later evolutionary stages of massive stars. The Chandrasekhar limit is named after him.)


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