Science behind sports

Butterflies

What is this sport?
Butterfly is a swimming technique. It is a swimming stroke with both arms moving at the same time and butterfly kicks (also known as dolphin kicks). 

The physics behind this sport

As the swimmer pushes against the water with his arms he accelerates. The drag from the water slows him down. 

We've learned and why we thought it was interesting: 

Playing around with the adjustments we learned that if we put all 3 legs, streamlining and arms on Olympic, the faster and accurate the swimmer's velocity and body movement and position is. We found it interesting because if we put each 3 on different levels the results would also be different. Also what we learned is that the movement of the swimmer's legs slows you down instead of giving you that extra speed.  

Trampoline 

What is it?

A trampoline is a fun and hazardous equipment.

The physics behind this sport

• Gravitational potential energy - 
• Elastic potential energy -
•  Kinetic energy -

 A trampoline can store elastic potential energy, just like a spring. The amount of energy stored depends on how far the spring stretches. The elastic energy can be released as kinetic and makes the jumper bounces back up. 

We've learned and why we thought it was interesting: 
We learned the patterns on how the energy was released. We thought it was interesting because  how elastic was the lowest point. We also learned that it stores the amount of energy depending how far the spring stretches.We found it interesting because we never really thought the spring would be a big part of the trampoline but just a little tool to hold the mat together.