Klas Fizik 11yèm ane IB yo te chèche konnen ki jan fòmatè chè yo vrèman bon, lè yo mezire koyefisyan friksyon sou sifas sèk ak mouye. Soulye ki anba a te fè trè byen pou tou de static and dynamic (sliding) friction on a ceramic surface, but the owner won’t let us test it in the mud – I don’t remember my trainers ever staying this clean for long when I was a teenager!
Dr Westwood
Entènasyonal Lekòl 
