net force - sum off all forces , force - push or pull , field - area which an obj experience force , energy - ability to do work/cause change , stationary - non-moving , static  - resists motion starting , drag - opposes motion , unbalanced force - causes an object to accelerate , acceleration - speed up, slow down, or change direction , exothermic - reaction release energy , neutron - no charge in atom , electron - tiny negative particle in atom , fission - nuclear decay , fusion - 2 small nuclei combine ,

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