Young's Modulus
Properties of Matter

Elastic kangaroos

Stories from Physics for 11-14 14-16 IOP RESOURCES

Researchers have found that the way in which large kangaroos move has an interesting feature — the metabolic cost of the marsupials’ movement is independent of speed, making their hopping gait highly efficient. Typically, metabolic costs are proportional to speed, but kangaroo-hopping has an energetic advantage over other animals, particularly at high speeds. During hopping, energy is stored in collagen in the hind legs but the reasons underlying the efficiency of the motion are not well understood. Researchers have modelled kangaroo muscles as having a maximum stress of 300 kPa and have estimated that a typical 50 kg kangaroo can store nearly 360 J of strain energy, by contrast with the 55 J stored by similarly sized mammals.

References

Young's Modulus
appears in the relation E=σ/ε
can be represented by Stress-Strain Graphs

Disable node explorer

Off
Limit Less Campaign

Support our manifesto for change

The IOP wants to support young people to fulfil their potential by doing physics. Please sign the manifesto today so that we can show our politicians there is widespread support for improving equity and inclusion across the education sector.

Sign today