ocr: How does friction make things hot? Everything that moves has kinetic energy. When friction slows something down, it reduces that object's kinetic energy. However, this energy doesn't disappear, 1t simply changes into another form of energy, usually heat. You can feel the heat caused by friction just by rubbing your hands together vigorously. However, friction sometimes generates more heat energy than we need. For example, a machine packed inside a tight space, such as a car engine, makes a lot of friction and may get hot enough to melt. This is why a good lubricant, such as oil or grease, is u ...
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