The torque about the origin O due to a force F acting on an object with position vector r is the vector quantity r F If several forces Fj act at positions rj, then the net torque (units N m or lb ft) is the sum Calculate the net torque about O at P, assuming that a 30 kg mass is attached at P Figure 21(B) The force Fg due to gravity on a mass m has magnitude 9 8m m s 2 in the downward direction r, ,

Question: The torque about the origin O due to a force F acting on an object with position vector r is the vector quantity =

The torque about the origin O due to a force F acting on an object with position vector r is the vector quantity τ = r × F. If several forces Fj act at positions rj, then the net torque (units: N-m or lb-ft) is the sum

= r, ,

Calculate the net torque about O at P, assuming that a 30-kg mass is attached at P [Figure 21(B)]. The force Fg due to gravity on a mass m has magnitude 9.8m m/s² in the downward direction.

0 F = 25 newtons 125 10 m (B) P Fg -X

= r, ,

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