Force of gravity - Water falling in a waterfall, gravity - What makes a book fall to the ground?, When you use snow tires to make driving in the snow easier. - friction, water dripping out of a faucet into the sink falls because - gravity pulls the water down, What makes you fall to the ground when you trip? - gravity, friction. - Starting a fire by rubbing sticks together., When you hit a ball back and forth with a tennis racket does it slow down each time you hit it, speed up each time, or change directions each time? - change directions each time you hit it.,

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