# Homework Help: Resisting pure bending

1. Aug 10, 2016

1. The problem statement, all variables and given/known data
to resist the bending, there must be reaction force(blue) act against the applied force(red), the reaction force that resist bending is the longitidunal normal force , right?
why the author stated it as longitidunal shear force, is it wrong?

2. Relevant equations

3. The attempt at a solution
longitidunal shear force is the green colour arrow, right? how could the force resist the bending?

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2. Aug 11, 2016

### haruspex

Your own diagram is inaccurate in several ways.
The set-up is a beam fixed at one end, with a transverse load applied at the other, not in the middle. There is no source of a force to provide the support you show in blue.
You do not show any forces where the beam is fixed. These forces will consist of a vertically upward force to balance the load, plus a torque to balance the moment of the load. This torque is transmitted in the form of the longitudinal shear forces.