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Through Engineers’ Eyes

You are on your way towards gaining Engineers' Eyes.
This short video explains what you have encountered and what is to come.

This short video reflects on what you have encountered and what is to come. The concept wheel below shows how it all fits in.

Wheel revealing the words Week 1 Load/extension for springs, stiffness of springs, linear/non-linear springs, static/dynamic conditions, Week 2 Forces revealed FBD, forces as a vector, components/resultants, equilibrium-forces at a point, Week 3 equilibrium-2D rigid bodies, more FBDs, conventional interactions, moments/couples Week 3 concept wheel (Click to expand)

In week 3 you saw how to analyse rigid bodies that are ‘planar’ – that is, two-dimensional, flat. You can often solve three dimensional problems with two dimensional models.

But first you needed to understand twisting effects. We used various terms – moments, couples and torque. Did you find this a tricky concept? Often, when learners have studied some of this work before, it begins to feel new at about this stage.

FBDs are even more important with rigid bodies, and the interactions you must represent are more complicated. Luckily there are standard methods for this – ‘conventional interactions’.

And so, you used equilibrium to find forces in planar rigid bodies. This is the basic capability that part 1 offers. But we went further. By calling upon Newton’s 3rd law you extended this capacity to ‘two dimensional statics of systems of rigid bodies’ – in your case a folding washing line.

That’s it. Part 1. You can now find unknown forces in systems of two-dimensional rigid bodies.

It’s time to celebrate.

Talking points

These are to get you started. Share any other thoughts you’ve had.

  • What concepts and techniques do you need if you want to find unknown forces on a rigid body?

Share your experiments

Don’t forget to share your experiments on the Through Engineers’ Eyes Padlet wall for this week.

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Through Engineers' Eyes: Engineering Mechanics by Experiment, Analysis and Design

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