SI unit of Torque | What is the SI unit of Torque
- Newton-meter
Dear students, we know that there are basically 3 types of motion i.e. linear motion, rotational motion and oscillatory motion etc.
For linear motion, force is required to change the position of object and do the work. According to Newton’s 2nd law of motion, the force is given as,
F = m.a
Where, a = acceleration of particle, and m is mass of the particle.
In rotational motion, the force is changed replaced with torque. Torque produced rotational motion. Mass is replaced by moment of inertia and linear acceleration is replaced by angular acceleration so as to give rise the magnitude of force responsible for rotational motion.
According to definition, ‘torque or moment of force is the product of force and the moment arm’ hence torque is given as,
In general,
Torque = force perpendicular distance between the particle and axis of rotation.
We know that, force is measured in newton and distance is measured in meter, then according to formula SI unit of torque can be given as,
newton – meter.
In symbol it can be written as N.m
Important Faq
Q.1) Torque is scalar or vector?
Answer: Since the torque is vector product of two vectors i.e force moment arm, it is a vector quantity.
Q.2) What is basic SI unit of torque?
Answer: According to formula,
τ = r.
τ = r.m.a (since f=ma)
Then SI unit can be, kg. m. m/s2
i.e. kg. m2/s2
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