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ANNOUNCING INTERACTIVE SESSIONS »
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Questions Received via Ask Me Email
March 15, 2010
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How contact force is related with physical pendulum?
A Physical Pendulum is any object suspended from a support, a knife edge in most cases but not located at its centre of gravity. Here the normal reaction offered by the knife edge is a contact force.
Have any other idea. Please feel free to post.
Why the magnetic field lines do not intersect?
Magnetic lines of force (also called magnetic field lines) are sooth curves in a magnetic field such that the tangent to it at any point gives the direction of magnetic field intensity at that point. So, if the magnetic field lines intersect anywhere, we can draw two tangents at the point of intersection indicating two directions of magnetic field at the same point WHICH IS NOT POSSIBLE
Is it clear.
Visitors are requested to post their answers and ideas.
CHAT TRANSCRIPT WITH A STUDENT (VISHNU)
Vishnu: when we bring a magnet near a Fe piece Fe moves from the initial position thus work is done.
Vishnu: where the energy from?
me: There cannot be any net gain of energy or work
me: Work done is ofcourse by spending energy
me: and here the work done is caused by the magnetic force
We can think a little more into it.
me: We are holding the magnet that is why the Fe moves towards you
me: In moving it may be doing work against friction or against gravity
Vishnu: yes and for accelerating too
me: When the Fe is near the magnet, if we consider two points – one near the magnet and one near the Fe, we can explain this in terms of magnetic potential energy.
me: A decrease in Magnetic potential energy is responsible for the work
when we attract lot of
the magnetic property reduces
me: Means that the Fe is more stable when it is close to the magnet than when it is away
every system longs for stability
me: The most stable position is the one with least PE
youtube is full of blunders
Vishnu: Lot of them titled free energy
me:me: Anyone can post a video, BUT There is no FREE LUNCH
Vishnu: ha ha
me: So far there is no process detected which provides a gain of energy.
but i suppose there is
with destruction of mass
me: mass is also energy in store
me: SO now we do not call mass and energy but together mass-energy
me: tHINGS AND FACTS ARE THERE EVEN IF WE DON'T KNOW IT
me: Gravity was there is there and will be there even if Newton didn't discover it
Vishnu: the best example
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