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70 views

Friction in driving car

We know friction helps in driving car, does this mean car can move faster on rough surfaces ? Since coefficient of friction is more on rough surfaces
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1answer
21 views

How are proportional relations derived in physics?

I would like to ask a simple question :How are proportional relationships in physics found? To be more specific, let's consider a simple law, Ohm's law, which states $\Delta V\propto I$. Now, it ...
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1answer
86 views

Injectivity of Physical Functions

Consider all functions in nature (except path functions like work) like internal energy, modulus of elasticity, electrical resistance of a material, etc. 1) Is there any function (as described above) ...
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0answers
52 views

Locus of a moving mass point

Two very small mass particles $m_1$, $m_2$ are connected by a $2l$ long, infinitely soft and inelastic thread without mass. The initial condition of the system before being freely released is as in ...
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0answers
56 views

Physical and non-physical solutions to Einstein's field equations

Einstein predicted gravitational waves in 1916 as a solution to his field equations. Apart from doing experiments, is it possible to tell which solutions exist in the real world and which don't? Are ...
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0answers
46 views

Justification of the State Postulate

I have just started thermodynamics (not with statistical approach but with macroscopic approach), in which the state postulate reads Only two independent intensive properties of a simple ...
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0answers
21 views

Symmetry and present value problems

Suppose we don't know any physical law of nature and we're studying, a system. Let's say a uniformly spherically charged distribution. Now this distribution has the property, that if you rotate this ...
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0answers
45 views

Laws of physics for a point in cyclical 2D motion

A follow up question to the question in What does the statement "the laws of physics are invariant" mean? and Formal definition of an observer? Which laws of physics are they talking about ...