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This problem involves calculating the force of friction acting on a block sliding on a horizontal surface with a constant velocity.

### Information provided:
- Mass of the block: \( m = 5 \, \text{kg} \)
- Velocity: \( v = 2 \, \text{m/s} \) (though this is not needed for the friction calculation, it indicates constant motion, which implies balanced forces)
- Coefficient of friction: \( \mu = 0.3 \)
- Gravitational acceleration: \( g = 9.8 \, \text{m/s}^2 \)

### Formula for the frictional force:
The frictional force \( F_{\text{friction}} \) is given by:
\[
F_{\text{friction}} = \mu \cdot F_{\text{normal}}
\]
Since the block is on a horizontal surface, the normal force \( F_{\text{normal}} \) is equal to the weight of the block, which is:
\[
F_{\text{normal}} = m \cdot g
\]
Substitute the given values into the equations:

\[
F_{\text{normal}} = 5 \, \text{kg} \cdot 9.8 \, \text{m/s}^2 = 49 \, \text{N}
\]
Now calculate the frictional force:
\[
F_{\text{friction}} = 0.3 \cdot 49 \, \text{N} = 14.7 \, \text{N}
\]

### Answer:
The force of friction acting on the block is **14.7 N**.

Would you like further details or have any additional questions?

Here are some related questions:
1. How would the friction force change if the coefficient of friction increased?
2. What happens to the frictional force if the block's mass increases but the coefficient of friction stays the same?
3. What type of frictional force would act if the block were moving on an inclined plane?
4. How would the force of friction differ if the block were accelerating rather than moving at constant velocity?
5. What is the relationship between kinetic friction and static friction?

**Tip**: In problems where the velocity is constant, it often implies that the net force acting on the object is zero.

Un bloque de 5 kg se desliza sobre una superficie horizontal con una velocidad constante de 2 m/s. Si el coeficiente de fricción entre el bloque y la superficie es 0.3, ¿cuál es la fuerza de rozamiento que actúa sobre el bloque? (g = 9.8 m/s²)

Calculate the frictional force acting on a 5 kg block moving at a constant velocity on a horizontal surface with a friction coefficient of 0.3. This problem uses key physics concepts like friction and Newton's Laws of Motion. Suitable for students in Grades 9-12.

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