Calculating Normal Force in a Bridge: Truck at x=29m - Step by Step Guide

[kitty9035]

1. Homework Statement [
A bridge of length L=72 m and mass 64000 kg is supported at each end. A truck of mass 20000kg is located at x=29m from the left support. Calculate the normal force at each support.

Homework Equations

T=F x sinx

The Attempt at a Solution

Is the normal force the same as the tension?

 

[radou]

I'd assume the 'normal' force at the support is the 'vertical' force, i.e. the statical force acting as a reactive force at the support.

 

[Ja4Coltrane]

think of each support as different possible origins of your system. Then figure out the upward force necessary to keep the sum of torques equal to zero.