Force - A push, pull, twist or rotation that can change how something moves or what shape it is., Gravity - A non-contact force that pulls objects towards each other. On Earth it pulls everything towards the ground., Weight - The force of gravity acting on an object. It is measured in newtons (N), not kilograms., Mass - The amount of matter (stuff) in an object. It is measured in kilograms (kg) and does not change, even if gravity changes., Air resistance - A force that slows down objects moving through air by pushing against them., Force field - The invisible region around an object where a non-contact force (like gravity, magnetism or electrostatics) can be felt., Magnet - An object that produces a magnetic force, which can attract or repel other magnets, and attract metals like iron and steel., Magnetic poles - The ends of a magnet (north and south) where the magnetic force is strongest., Electrostatic force - A non-contact force caused by electric charges. Opposite charges attract, like charges repel., Static electricity - A build-up of electric charges on a surface that can sometimes “jump” to another object, causing a small shock., Terminal velocity - The constant speed a falling object reaches when air resistance balances the pull of gravity.,

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