On Tuesday we learned about the property’s of materials and how heat And cold can change them. First we learned about the Titanic, the Dee bridge, and challenger a space shuttle. We learned about how they all broke even thought they used very strong materials. Then we talked about the different forces they might encounter. Mr. Calvert talked about how different materials have different properties. Like Cement which is very strong but easy to pull apart. Then we watched a video that showed a rod of steel be pull apart with a machine. He showed us what was happening and how steel is very ductile. Which means it is hard to pull apart. Then we learned how heat and cold could change the property’s. When the Titanic was on the water some of the iron froze. So when the iceberg hit it the iron shattered and made a huge hole. Also the dee bridge collapsed because iron broke from the vibrations of the train. And the challenger space shuttle vaporized and failed. Part of the rocket froze and made it break. And killed all the passengers.