Question

Масса подвижного блока и поднимаемого груза равна 48 кг.для поднятия груза необходима сила 260 н.найти величину силы трения.

Answer 1

F=m*g/2+Fтр
Fтр=F-m*g/2=260-48*10/2=20 H

Answer 2

Calculation of Frictional Force

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

Frictional Force (F) = Normal Force (N) × Coefficient of Friction (μ)

Given: - Mass of the movable block and the load = 48 kg - Force required to lift the load = 260 N

First, we need to find the normal force (N) acting on the block and the load. Then, we can use the coefficient of friction to calculate the frictional force.

Finding the Normal Force (N)

The normal force (N) can be calculated using the formula: N = mg where: - m = mass of the block and the load - g = acceleration due to gravity (approximately 9.81 m/s^2)

Using the given mass: m = 48 kg g = 9.81 m/s^2

We can calculate the normal force (N) using the formula: N = 48 kg × 9.81 m/s^2

Calculating the Coefficient of Friction (μ)

The coefficient of friction (μ) can be calculated using the formula: μ = F / N where: - F = force required to lift the load - N = normal force

Using the given force: F = 260 N

We can calculate the coefficient of friction (μ) using the formula: μ = 260 N / (48 kg × 9.81 m/s^2)

Calculating the Frictional Force

Finally, we can calculate the frictional force (F) using the formula: F = N × μ

We can substitute the calculated values of N and μ into the formula to find the frictional force.

Let's calculate the values step by step.

Calculation Steps

1. Finding the Normal Force (N) - N = 48 kg × 9.81 m/s^2 - N = 470.88 N

2. Calculating the Coefficient of Friction (μ) - μ = 260 N / (48 kg × 9.81 m/s^2) - μ ≈ 0.551

3. Calculating the Frictional Force (F) - F = 470.88 N × 0.551 - F ≈ 259.35 N

So, the calculated value of the frictional force is approximately 259.35 N.

Conclusion

The magnitude of the frictional force required to lift the load is approximately 259.35 N.