contact force - A force that requires two pieces of matter to touch is called ...., friction - ... is the force that results when two materials rub against each other., force - ... is a push or pull that acts on the object, balanced force - if two forces w the same magnitude act in opposite directions is called .... , non-contact force - the force that acts at a distance is called ....., gravity - the force of attraction between any two objects, non contact force - gravity, electric, and magnetic are example of ..., magnetic force - opposite pole join together, electric force - opposite charge join together , electricmagnets - engineers use electronics force to build powerful magnets , simple machine - ... is a machine made up of one or two parts, input force - When you do work, the force that you use is called the , output force - the force that the machine supplies is called the,

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