First slide

Torque

Question

Find the torque about the origin when a force of $3 \hat{j} N$ acts on a particle whose position vector is $2 \hat{k} m .$

Moderate

Solution

$\begin{array}{r} \vec{T} = \vec{r} \times \vec{F} \\ \vec{T} = 2 \hat{k} \times 3 \hat{j} \\ = - 6 \hat{i} \end{array}$

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