Sobre un cuerpo de 700 g de masa que se apoya en una mesa horizontal se aplica una fuerza de 5N en la dirección del plano. Calcula la fuerza de rozamiento si:

a)El cuerpo adquiere una aceleración igual a 1,5 m/s2

b)El cuerpo se mueve con velocidad constante.

(a) Ff = 3.95N

(b) Ff = 5N

Explanation:

(a) To find the friction force you use the second Newton law:

But you take into account the applied force and the opposite friction force:

you do Ff the subject of the formula and replace the values of the parameters:

(b) In the case of a motion with constant velocity you have that there is no acceleration. Hence:

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