IQWST PS2 Lesson 4 Elastic Energy
Lesson 4 Reading One Guide - Elasticity and the Body
1. Why can stretching too far hurt your muscles? This is because muscles have an elastic limit.
2. What is an elastic limit? The limit is the point at which an object stops stretching and starts to tear. At that point, an object cannot return to its original shape.
3. What are connective tissues for? They connect bones to other bones, and bones to muscles.
4. What are examples of connective tissues? tendons, ligaments, and cartilage.
5. Why are cartilage and ligaments elastic? They have a protein called elastin in them that makes them elastic.
6. Why are cartilage and ligaments good shock absorbers? They can easily be stretched or compressed and then return to their original shape. This allows them to be good shock absorbers, just like pillows.
7. Where does the stress that your body feels from moving around and jumping come from? It is the result of a constant series of energy conversions from kinetic and gravitational energy into elastic energy and back again.
8. Describe the function of discs found in between each of your vertebrae. These discs are responsible for distributing the impact that your body feels every time you take a step. With each step, pressure is put on these discs, compressing them and transforming kinetic energy into elastic energy.
9. What happens to your discs as you walk? When the pressure is released, the discs decompress (return to their original shape), and their elastic energy is transformed back into kinetic energy.
10. What will happen if you pull on the skin on your face and let go of it? Because skin is very elastic, it will go right back to its original shape. If your skin were not elastic, it would sag.
11. What is the function of elastin in the skin? Elastin allows the skin to be flexible.