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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.

Beam Me Up

Age 16 to 18 Challenge Level:

Understanding the formula $\psi = \int \kappa ds$

Consider a beam which is a perfect arc of a circle



Calculate $\int \kappa ds$ along this section. Can you relate $\phi$ to $\psi$?

Finding $v$ in terms of $\kappa$ and $x$

Consider a very small section of the beam, curved length $\delta s$ and vertical deflection $- \delta v$. Can you express $\delta v$ in terms of the other quantities?