weight - force of gravity on an object, mass - amount of matter in an object, kilograms - units for mass, Newtons - units for weight, friction - force opposing motion, example of non-contact force - gravity, example of contact force - friction, air resistance - friction that acts on an object moving through air, terminal velocity - object falling at a constant speed, force - push or pull, magnetic field - region where a magnetic force is experienced, static electricity - build up of electric charge, temporary magnet - something that keeps its magnetism for a short time, negative charge - electron, nucleus - centre of an atom,

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