hypothesis - an idea or explanation for something that is based on known facts but has not yet been proved, accuracy - the ability to do something without making mistakes, refraction - the fact of light or sound being caused to change direction or to separate when it travels through water, glass, etc, centripetal - moving towards the point around which it is turning, inertia - the physical force that keeps something in the same position or moving in the same direction, momentum - the force that keeps an object moving, velocity - the speed at which an object is travelling, equilibrium - a state of balance, saturate - to make something or someone completely wet, solubility - the quality of being able to be dissolved, or the degree to which something can be dissolved,

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