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## Design: Trimming a paper model aeroplane

You would usually trim a paper model aeroplane by trial and error, but if you do it by calculation you’ll also develop your engineers’ eyes. This video explains the problem …

## Centre of gravity

Engineers often defy gravity. Think of bridges, aeroplanes, or houses. Even washing lines (seen in Week 3). To understand their tasks they need to know the magnitude of the gravity …

## Retro tutorial – Week 4

Once again, here’s your opportunity to quietly work through problems using pencil and paper. In this Retro tutorial you will recognise two-force objects. Then you’ll find centres of gravity for …

## Analysis: Centres of gravity of composite bodies

If you know the location of the centre of gravity of each component of an object you can find the overall centre of gravity of the whole thing. You do …

## Analysis: Interpreting the tests

Although the two methods look quite different, in both cases the weight vector passes through the pivot so that its moment arm is zero. This video explains in detail how …

## Analysis: Two-force objects

Recognising two-force objects can simplify analysis and help understanding. They are part of engineers’ eyes. We’ve used the concept already; this brief video will explain what they are and how …

## Experiment: Finding centres of gravity by balancing

These experiments provide an alternative approach to locating the centre of gravity. It’s all part of generating engineers’ eyes. You can download instructions to the experiment in the Downloads section …

## Experiment: Finding centres of gravity by suspension

These simple, quick experiments will give us plenty to analyse later. You can download instructions to the experiment in the Downloads section below. Talking points In the video, did you …

## Designing a flat belt drive

We’ll give you all the guidance you’ll need for designing this engineering component. The video leads you through the process with opportunities to do calculations yourself involving belt tensions, rope …

## Through Engineers’ Eyes

This quick video highlights your progress towards Engineers Eyes. The concept wheel shows how it all fits together. Week 5 concept wheel (Click to expand) Friction is tricky. Sometimes you …

## Retro tutorial – Week 5

There’s no better way to consolidate learning in Engineering Mechanics than quietly working through problems using pencil and paper (that’s why we call this a ‘Retro Tutorial’). This is a …

## Analysis: Rope around a bollard

This analysis produces the most delightful equation. We’ll state it without proof, but if you know calculus, look it up and revel in its elegance. You’ll be using it for …

## Analysis: Will it tip or will it slide?

Here is a classic problem with important practical applications. For example, it can help you when shifting furniture. More importantly it can enlighten you about the stability of road vehicles. …

## Analysis: Basic model of dry friction

Two Frenchmen constructed our basic model of friction. It’s rough and ready but often is useful enough for practical purposes. With their ideas we can represent friction on Free-Body Diagrams …

## Three quick experiments on friction

These experiments will open your eyes and get you thinking about how the world works. They’ll get you ready for the theoretical models of friction that are to come. They …