Gravity - Force of attraction between all objects. Denoted by g., Weight - Force equal to mg where m is the mass of the object. Acts vertically downwards., Normal reaction - The force which acts perpendicular to a surface when an object is in contact with the surface., Friction - A force which opposes the motion between two rough surfaces., Tension - The force acting on an object being pulled by a string., Thrust - The force acting on an object being pushed along using a light rod., Buoyancy - An upward force on a body that allows it to float or rise when submerged in a liquid., Newton - Unit of measure for weight/force,

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