friction, a contact force acting in the opposite direction, lubricant, a substance that lessens friction, contact force, a force where one object is touching another, microscopic bumps, very very tiny objects that cause friction, high friction, friction designed to firmly grip on to a surface, low friction, friction allowing you to glide, surface, the top of something, kinetic energy, movement energy, thermal energy, the heat of energy, reduces, makes smaller or lessens.

Friction

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