Question

Брусок массой 0.5 кг прижат к вертикальной стене силой 10Н, направленной горизонтально и перпендикулярно стене. Для равномерного подъема бруса вертикально вверх к нему нужно приложить силу равную 9Н. каков коэффициент трения скольжения между брусом и стеной?

Answer 1

F=9 H F1=10 H
F=u*F1+m*g
u=(F-m*g)/F1=(9-0,5*10)/10=0,4

Answer 2

Calculation of the Coefficient of Sliding Friction

To calculate the coefficient of sliding friction between the block and the wall, we can use the given information about the forces applied.

The block has a mass of 0.5 kg and is pressed against the vertical wall with a force of 10 N, directed horizontally and perpendicular to the wall. To lift the block uniformly upwards, a force of 9 N needs to be applied to it.

The coefficient of sliding friction can be calculated using the formula:

Coefficient of Sliding Friction (μ) = (Force of Friction) / (Normal Force)

The force of friction can be calculated as the difference between the applied force and the force required to lift the block:

Force of Friction = Applied Force - Force to Lift the Block

Let's calculate the coefficient of sliding friction step by step:

1. Calculate the force of friction: - Applied Force = 10 N - Force to Lift the Block = 9 N - Force of Friction = 10 N - 9 N = 1 N

2. Calculate the normal force: - The normal force is the force exerted by the wall on the block, perpendicular to the wall. - Since the block is pressed against the wall, the normal force is equal to the weight of the block. - Weight = mass * acceleration due to gravity - Weight = 0.5 kg * 9.8 m/s^2 = 4.9 N

3. Calculate the coefficient of sliding friction: - Coefficient of Sliding Friction (μ) = Force of Friction / Normal Force - Coefficient of Sliding Friction (μ) = 1 N / 4.9 N ≈ 0.2041

Therefore, the coefficient of sliding friction between the block and the wall is approximately 0.2041.

Please note that the calculations are based on the given information and assumptions about the forces and their directions.