The energy is converted to other types of energy, namely heat and sound. The steeper the slide and the faster you’re going, the more noticeable it will be. If you’ve ever dragged your bare skin while going down a slide and had a slight burn, or the loud squeaking your shoes make if you drag them to stop yourself.
I’m less certain about this part(high school physics was a long time ago), but I believe some of it would also be converted to potential energy. If you stopped yourself halfway down a steep slide, you would have to use some effort to hold yourself there because of gravity. As soon as you let go, you would start gaining momentum again(kinetic energy).
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