why we express the unit of torque in Nm.even though it can
be expressed as Joule ( J )?
Answers were Sorted based on User's Feedback
Answer / ranjeet k jaiswal
Torque is a vector qty ,that is why we use vector unit Nm.
Joule is used for scalar qty.
Is This Answer Correct ? | 29 Yes | 6 No |
Answer / naseeb ahmeds
The torque is directly depend on applied force& distance at
which it is acting so it is-N-m
we are getting a secondary motion from torque,which can give
us the energy but the phillosophy behind this is a motion
not an direct energy......and joule is a unit of energy.
Is This Answer Correct ? | 26 Yes | 14 No |
the eq. of TORQUE = FORCE X RADIUS
& NEWTON & METER are the one of the units of
Force & radius respectively
Is This Answer Correct ? | 31 Yes | 21 No |
Answer / manojsiva v
work done(form of energy)=force.distance (dot product ie scalar quantity,energy is always scalar)
torque=force*distance (vector quantity,cross product)
torque and energy are related by
energy=torue.(theta)
a torque of 1 N m applied through a full revolution will require an energy of exactly 2π joules
torque=1Nm
theta=2π
hence conventionally in SI unit energy is represented in joule and torque is not a form of energy so Nm.
Is This Answer Correct ? | 10 Yes | 2 No |
Answer / karthick
torque is related to work done.it is expressed as force *
radius.so its unit should be N-m whereas joule is used to
represent the heat given out from a process
Is This Answer Correct ? | 5 Yes | 1 No |
Answer / nandakumar
Joule is the unit of energy. 1J= 1 Nm.
Energy = force * displacement ( N*m)
but Torque = force * radius (N*m) but there is no displacement.when we apply a torque on a body, if work is done the body will rotate.
then work done is calculated as torque*angular displacement
so the unit is N*m*radian(unit of angular displacement)
hence 1J=1 N*m*radian. the radian is an auxiliary unit and is always hidden when it is multiplied with metre.
so 1Nm torque is not equal to 1 J but 1Nm energy = 1J
Is This Answer Correct ? | 2 Yes | 0 No |
Answer / saurabh malviya
joule is always a unit of energy no matter of which type
it is ... torque is simply nt an energy bt a cause of
energy dats why its nt expressed in joule ...
Is This Answer Correct ? | 1 Yes | 0 No |
Answer / anil
Torque is mechanical energy and Joule is its equivvlent in
heat energy
Is This Answer Correct ? | 5 Yes | 5 No |
Answer / khalid usmani
for example .
if we have to find diameter of shaft of any material and we
take as C-45 material of shaft whose permissible shear
stress is 45*10^6 N/M^2
SO as Torque = (22/7)/16 * (shear stress) * d^3
therefore its unit will be Nm
Is This Answer Correct ? | 2 Yes | 5 No |
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