Un bloque de 2 kg es lanzado a lo largo de un piso horizontal. El bloque inicia su movimiento lineal con rapidez de 5 m/s y se detiene después de recorrer 2 m. ¿Cuál es el coeficiente de fricción entre el bloque y el piso?

El coeficiente de fricción entre el bloque y el piso es 0,64.

Explanation:

Podemos hallar el coeficiente de fricción usando la definición de trabajo:

En donde:

Kf es la energía cinética final =0

Ki es la energía cinética inicial

m: es la masa = 2 kg

v: es la velocidad = 5 m/s

Además el trabajo es el producto de la fuerza de rozamiento (Fr) por el desplazamiento (d), por lo que tenemos:

Por lo tanto, el coeficiente de fricción entre el bloque y el piso es 0,64.

Espero que te sea de utilidad!

graphing motion: mastery test

209be

what is the instantaneous acceleration of

the particle at point b?

0 meters/second?

10 meters/second?

12 meters/second?

velocity imetersisecond

15 meters/second?

20

time (seconds)

answer: 0 meters/second^2

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.