Today we got to test our rollers speed, strength and distance travelled, after making our predictions and collecting some data about how we built our rollers we were ready to go!
Check out the slope that the roller Flame could climb!
We looked at our data at the end and worked out that to make a great roller we needed:
*Between 2 and 5 strong elastic bands in the middle to store energy (but not too much!)
*Some thick, smooth carefully set out elastic bands to create more friction on the outside
* A long, smooth stick to transfer the energy to move the roller., without increasing friction
Who will build the ultimate roller!?