### Overarch 2

Bricks are 20cm long and 10cm high. How high could an arch be built without mortar on a flat horizontal surface, to overhang by 1 metre? How big an overhang is it possible to make like this?

### Stonehenge

Explain why, when moving heavy objects on rollers, the object moves twice as fast as the rollers. Try a similar experiment yourself.

### Maximum Flow

Given the graph of a supply network and the maximum capacity for flow in each section find the maximum flow across the network.

# Euler's Buckling Formula

##### Stage: 5 Challenge Level:

In the second diagram, at the point $x$ what is the moment due to the axial force?

The mathematics behind moments of forces are typically covered in early A-level Mechanics modules. The methods for solving 2nd order differential equations are typically done in the A-level module FP2.