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astraxan [27]
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.
Physics
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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\theta=23.7^{\circ}

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