A two-dimensional object placed in the xy-plane has three forces acting on it: a force of 3.0 N along the x-axis acting at a point (3 m, 4 m); A force of 2.0 N along the y-axis acting at (-2 m, 5 m); and a force of 5 N in the negative x direction acting at (-2 m, -3 m). What is the net torque about the point (-1 m, 1 m)?
A)7 N m counterclockwise
B)23 N m clockwise
C)3 N m counterclockwise
D)31 N m clockwise
E)7 N m clockwise

Question

Quizplus · Accepted Answer

The net torque is calculated by summing the torques due to each force about the point (-1 m, 1 m). The torque due to each force is given by τ = r × F, where r is the position vector from the point to the point of application of the force, and F is the force vector. Calculating each torque and summing them gives a net torque of 31 N m clockwise.

A Two-Dimensional Object Placed in the Xy-Plane Has Three Forces