# Isn't inertia experience by person in moving bus same as torque

When a bus moves suddenly, the person standing in it tilts backwards. This concept is explained using inertia(tendency of body to resist change in its state of motion) but when the bus moves suddenly, can't we also say that the torque applied due to frictious force on our feet causes our upper body to move backwards?

The free body diagram is on the right with the tension in the string $$\vec T$$ and the weight of the bob $$m\,\vec g$$.
$$\vec F = \vec T + m\,\vec g$$ and $$\vec F = m\,\vec a$$