The Friction Force: In order to calculate the force or acceleration of a body, it must be considered that the surfaces on which they are displaced do not exert any force against the movement.
Because when a force was applied, there was a non-stop displacement.
No matter how smooth a surface is, it is not free from friction. When a force is applied to a body on a surface, that body ends up stopping.
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When pushing a car, we observe that until the car starts moving, it is necessary to apply a force greater than the force when the car is already moving.
It is a force that acts when bodies do not slide. This force is equal to the minimum force needed to move the body.
When a body is at rest, the frictional force must be greater than the applied force. In the calculation a static friction coefficient is used.
It is applied when there is a slippage of bodies. This is when the friction force is surpassed by the force exerted on the body, which will start to move and at this moment, it is considered dynamic friction force.
The dynamic frictional force will always be less than the applied force. For calculation the kinetic friction coefficient is used.
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