What is Friction - A friction force by air pushing against moving objects., When is friction unhelpful? - Wears out shoes, heats machines, slows bikes/cars., When is friction helpful? - Walking, writing, holding objects, car brakes., What is air resistance? - A friction force by air pushing against moving objects., What is magnetic force - Force that attracts iron and steel., What can a force do? - Move things, stop things, change speed, change direction, change shape., What is gravity? - A force that pulls everything down to Earth., What is friction? - A force that slows things down when surfaces rub together., What is a Force? - A force is a push or a pull.,

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