Contact Force - A force that can only act on an object that is touching it., Friction - A type of force that acts against an object's motion., Stops or slows down an object's motion. - The effect of friction on an object's motion., Air resistance - Friction force acting on an object as it moves through air., rougher - The ____________________ the texture the surface is the greater the friction force., smoother - The ____________________ the texture the surface is the smaller the friction force., larger - The larger the surface area in contact, the greater the friction force., smaller - The _______________ the surface area in contact, the smaller the friction force., harder - The __________________ you push ab object, the greater the friction force., lubrication - Adding this item can reduce the friction force acting on an object., streamline / aerodynamic - This shape reduces the friction force acting on an object.,

Contact Forces

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