what is friction force
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Friction is a force that opposes the motion of an object by being in contact with it.
This is an example: the break in a train engine. It consists of a piece of metal that is pressed (contact) to the rolling wheel to create a resistance to the movement, and thus, ultimately, bringing the convoy to a stop. Recall that the definition of mechanical force is F= m*a (force equals mass multiplied by the acceleration given to such a given mass). In a brake, because the friction is diminishing the velocity of the vehicle, i.e. de-accelerating it, the expression will be F= m*(-a) or -F = m*a, a “negative” force.
This is an example: the break in a train engine. It consists of a piece of metal that is pressed (contact) to the rolling wheel to create a resistance to the movement, and thus, ultimately, bringing the convoy to a stop. Recall that the definition of mechanical force is F= m*a (force equals mass multiplied by the acceleration given to such a given mass). In a brake, because the friction is diminishing the velocity of the vehicle, i.e. de-accelerating it, the expression will be F= m*(-a) or -F = m*a, a “negative” force.
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Friction force is a contact force that opposes a moving body as it acts in the direction opposite to the direction of motion of the body
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