friction , a force that resists movement when two surfaces touch, capacity , the maximum amount something can hold or handle , clearance, the small space between two parts in a machine so they can move freely, acceleration, the rate at which speed changes over time, velocity, speed in a specific direction, deceleration, the rate at which something slows down, schedule, a plan of tasks and times in a project, failure , when a system or material stops working correctly.

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