For ‘Engineering Week 2019’, we have been learning about different types of engineers and their various roles.
After discovering some really interesting facts, we were tasked with an engineering challenge of our own!
We had to work as an engineer to design and construct a rubber band powered car.
We began by exploring our materials (cardboard, axles, wheels, elastic band, paper clip) and planning our design.
Then we moved onto the construction stage. This involved folding the cardboard into a box shape (also known as a chassis) and fitting the axles through the front and rear holes on the chassis. Next, we had to fit wheels to the end of each axel. Finally, we had to wrap the rubber band around the rear axle and then attach the rubber band to a fixed position on the front axle of the car.
Although we found it rather difficult to fit the rubber bands, we eventually managed to complete the design.
The final part of our challenge required us to test the rubber band car.
To do so ,we hand to wind up the real axle that was attached to the rubber band and then let it go. This caused the car to move forward.
When you wind up the car’s axle you stretch the rubber band and store potential energy. When you release it the rubber band starts to unwind, and the potential energy is converted to kinetic energy as the car is propelled forward.
We had great fun creating and testing our own parachutes in 3rd Class! Each group in the class decided to test a different material when making their parachutes to see which material worked the best. The materials used included tissue, paper, tracing paper, plastic, cardboard and fabric. We discovered that plastic worked the best and gave our pencil passenger the safest, steadiest landing! We also decided to test parachutes of different sizes. We discovered that the larger the surface area of the parachute, the more air resistance it will encounter. This means that larger parachutes will fall more slowly than smaller parachutes.
We have been experimenting and testing the force of water on objects by investigating things that float and sink.
To begin we collected a variety of items from around the classroom to investigate. As a class we predicted which items would sink and float in water. Next, in our groups, we took turns to test the items to see if they would sink or float. Lastly we sorted the items into two groups; sink or float and we recorded our results.
The second activity we completed was ‘Design a Boat’. Firstly we experimented with a ball of plasticine to see if it would sink or float and if changing its shape would make a difference. Then in our groups we tried to use the plasticine to design a boat that would float. If we were successful we tested our boat to see how many ‘passengers’ (dried peas) it could carry. After a few attempts some groups were successful! 🙂
The last activity we completed was an experiment called ‘Dancing Raisins’. We predicted what would happen to the raisins in water and in soda water and then observed the differences between the two types of water. We were amazed to watch the raisins begin to ‘dance’ in the soda water! Why do you think this happened?! 🙂
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