Friction - The force between two surfaces., Air resistance - Friction between air and an object., Gravity - The force that pulls objects towards the centre of the Earth., Newtons - The unit that forces are measured in., Newton Meter - The tool used to measure force., Propulsion - The force that moves an object forward., Upthrust - The force present in water that stops boats sinking., Water resistance - A force which slows moving objects down in water.,

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