Why it makes perfect sense for this bike to have two gears and two chains
The Buffalo Bicycle Utility S2 has won an award from Eurobike and earned a German Design Award. With components designed by ...
BBC1 年
Science/Physics KS2/KS3: Will gears let children pull a piano uphill with their bikes?
The bike with the low gear is easier to pedal. Children then use their understanding of gears to decide which gear they will need to use to pull the piano uphill. This short film is from the BBC ...