An object in motion stays in motion with the same velocity unless acted on by an unbalance force. That is newtons 1st law. Skiing demonstrates this because you are staying in motion by resisting the force of gravity and friction, so you are the inbalance force. An ubalanced for is a force when two object pushed against each other and one wins. So there is an unbalanced for. So when you skiing your that ubalanced force which is resisting gravity and friction.
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