Contact: opening a door, boy tugs on his dog's lead, Non-contact: a window closes suddleny, pins move towards a magnet when close, Balanced: two teams tie a tug or war competition, two forces are opposite and equal, Unbalanced: the swing speeds up when pushed, a boy kicks a soccer ball, Changes shape: crushing a can in your hands, squeezing a sponge, Doesn´t change shape: pressing a coin hard between your fingers, squeezing a brick,

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