Dealing with friction in machines By garikaib|2017-01-17T11:11:57+02:00July 8th, 2016|Notes, O Level Science Notes, Ordinary Level Notes| Pouring oil into an engine. Image credit tenerifenews.com ZIMSEC O Level Combined Science Notes: Dealing with friction in machines Friction is the force that opposes all movement It is the resistance that one surface or object encounters when moving over another Work must […]Quick NetOne, Econet, And Telecel Airtime Recharge Number to recharge: Airtime amount ($): EcoCash number: Buy {{error_message}} {{error_message}} Read More Comments Off on Dealing with friction in machines