Gravity  - The force that attracts objects to the centre of the Earth., Air resistance - The force that acts in the opposite direction to an object moving through the air., Streamlined - A form that presents very little resistance to a flow of air or water., Force - A push or a pull, Newton Meter - Instrument to measure force, Water resistance - The force that uses friction to slow down objects that are moving through a liquid., Friction - A force affected by different types of surface.,

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