Question

При укладке асфальта рабочий вручную перемешает каток массой 50 кг с силой 4,9 H.Определите величину коэффициента трения качения.

Answer 1

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Answer 2

Calculation of the Coefficient of Rolling Friction

To determine the coefficient of rolling friction, we need to use the given information about the force applied and the mass of the roller.

The formula for rolling friction is:

Fr = μ * N

Where: - Fr is the rolling friction force - μ is the coefficient of rolling friction - N is the normal force

In this case, the force applied is 4.9 H (H is the symbol for hectonewtons) and the mass of the roller is 50 kg.

To calculate the normal force, we can use the formula:

N = m * g

Where: - m is the mass of the roller - g is the acceleration due to gravity (approximately 9.81 m/s^2)

Let's calculate the normal force first:

N = 50 kg * 9.81 m/s^2 = 490.5 N

Now we can calculate the coefficient of rolling friction:

Fr = μ * N = 4.9 H

Substituting the values:

4.9 H = μ * 490.5 N

To find the coefficient of rolling friction (μ), we can rearrange the equation:

μ = (4.9 H) / (490.5 N)

Calculating the value:

μ ≈ 0.01

Therefore, the approximate value of the coefficient of rolling friction is 0.01.

Please note that the sources provided do not contain specific information about the coefficient of rolling friction for asphalt or the given scenario. The calculation is based on the general formula for rolling friction.