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# Overarch 1

When we have 3 tiles stacked in equilibrium the overall weight of the tiles is (obviously) 3. To balance on the fourth tile the centre of mass of the 3-tile combination must (obviously) be exactly on the edge of the fourth tile.

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Age 16 to 18

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When we have 3 tiles stacked in equilibrium the overall weight of the tiles is (obviously) 3. To balance on the fourth tile the centre of mass of the 3-tile combination must (obviously) be exactly on the edge of the fourth tile.

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?

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

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