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3 years ago

6

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. Calcu

la 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.

1 answer:

kicyunya [14]3 years ago

6 0

Answer:

(a) Ff = 3.95N

(b) Ff = 5N

Explanation:

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

$F=ma$

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

$F_a-F_f=ma$

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

$F_f=F_a-ma=5N-(0.700kg)(1.5m/s^2)\\\\F_f=3.95N$

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

$F_a-F_f=0\\\\F_f=F_a\\\\F_f=5N$

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