When two surfaces slide against each other, a force called friction makes them stick very slightly together. Smooth surfaces, like ice and glass, are easy to slide over. They create very little friction. Rough surfaces like rock and sand create much more friction, and are easy to grip on to.
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Answer: Gamma rays, x-rays, ultraviolet rays, visible light, and infrared rays.
Kinetic energy is the energy the makes an object move.
