gravity - the force that pulls objects to the centre of the Earth, air resistance - a type of friction between a moving object and air particles, friction - a contact force that acts in the opposite direction to movement, upthrust - a force that pushes things up in water, water resistance - type of friction between a moving object and water, mass - the amount of matter that makes up an object, Newton - the unit of measure for force, streamlined - a shape that reduces water or air resistance, weight - the force that acts on a mass due to gravity,

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