Which of these is false about torque

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Torque can exist even when the force is not perpendicular to the moment arm, meaning that the first statement is false. The second statement is also misleading, as torque can be generated by forces applied at angles other than perpendicular. Torque can indeed be produced by forces acting at various angles, such as 45 degrees. The direction of torque can be clockwise (cw) or counterclockwise (ccw), depending on the force's orientation. Therefore, the discussion clarifies that the first statement about torque being zero unless perpendicular is incorrect.
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Which of these is false about torque:
1) torque is 0 unless the force is pointed perpendicular to the moment arm
2) it can only be prodcued by a force
3) torque may pt cw or ccw, depending on direction the force points


I don't know which one of these is false. They all seem pretty true to be, although I suspect #2.
 
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think about it, what if the force is at a 45 degree angle to the moment arm? Would the torque be 0 in that case?
 


cryptoguy said:
think about it, what if the force is at a 45 degree angle to the moment arm? Would the torque be 0 in that case?

No. Oh I see so choice 1 is wrong! Thanks!
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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