o Torque is vector quantity. o o
The moment of a force vanishes if either The magnitude of the force is zero, or o The line of action of the force( r sinΘ) passes through the axis.
Example: Determine the torque on a bolt, if you are pulling with a force F directed perpendicular to a wrench of length l cm?
Solution: t = r x F = rF sinΘ In this case Θ = 90 o
o
The quantity angular momentum is the rotational analogue of linear momentum.
o It could also be referred to as moment of( linear) momentum. o l = r × p