1) tug of war a) contact force b) non-contact force 2) squeezing toothpaste a) contact force b) non-contact force 3) Falling apple a) contact force b) non-contact force 4) magnetic force a) contact force b) non-contact force 5) pulling luggage a) contact force b) non-contact force 6) papers stick to balloon a) contact force b) non-contact force

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