Squeezing lemons to make lemonade, push, pull, change speed, Pinning a paper on the bulletin board, gravity, push, pull, Punching a hole on a paper using a punching machine, direction, push, pull, When walking, friction is useful, true, false, Which of the following changes when you open the umbrella, texture, shape, speed, What makes the raindrops fall, friction, gravity, direction, When tying your hair, friction is useful, true, false, When skiing, friction is useful, true, false, When lighting a match, friction is useful, true, false, When sliding, friction is useful, true, false

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