mechanical friction is when two mechanics create friction
The inverse of it's sliding friction coefficient. It's slippery-ness.
Sliding friction is the force that opposes the motion of an object sliding along a surface. Rolling friction, on the other hand, is the force that opposes the motion of an object rolling over a surface. Rolling friction is generally less than sliding friction, making it easier for objects to move when rolling rather than sliding.
Friction opposes motion. As long as you define the direction in which the object is moving to be positive, the acceleration due to friction will be negative. If you think about it, you start out with positive speed and friction decreases the speed, so adding friction subtracted from the speed. Note: Friction is counterintuitive when you start dealing with rolling without slipping. This answer doesn't address this.
definir - to define defino - I define defines - you (singular, informal) define define - you (singular, formal) define, he/she defines definimos - we define defineis - you (plural, informal) define definen - you (plural, formal)/ they define.
We can define frictions as the Resistance to the movement of one body in relation to another body with which is in contact. If we try to slide a wooden block across a table then friction acts in the opposite direction to the movement of the block.
define skidding.... 30mph.
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Define processes on either end of communication. Define the types of messages. Define the syntax of messages. Define the meaning of any informational fields. Define how the messages are sent and the expected response. Define interaction with the next lower layer.
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the meaning of a word
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