Force - A pull or a twist, Air resistance - Force on objects moving through air, Friction - Force between touching objects, Gravity - Force of attraction between objects, Newton - Unit of force, Non-contact force - A force between objects not touching, Upthrust - Force pushing objects up in liquid and gas, Water resistance - Force on objects moving in water, Weight - Amount of force due to gravity's pull, Compress - Squash an object, Extension - Amount a spring gets longer, Force meter - Used to measure force, Hooke's Law - A law related to spring extension, Stretch - Pulling something to make it longer, Lubricant - Substance to reduce friction,

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