# How Is Friction Force Calculated in Physics Problems?

• hkin2019
In summary, the problem involves finding the force of friction on a box on a slope in the horizontal direction. The box has a mass of 64.7 kg and is subject to a force of 2327.9 N. The dynamic and static coefficients of friction are given as 0.19 and 0.37 respectively. Using the equation FF = μ x FN, the force of friction on the box is calculated to be 120.59 N. However, it is recommended to work with units and the values given may not be sufficient to fully solve the problem. Additionally, more information such as the angles T1 and T2 and a sketch of the setup are needed to provide a complete solution.
hkin2019

## Homework Statement

Box Mass = 64.7 kg T1 = 22.5° T2 = 54.1° F = 2327.9 N

μdynamic = 0.19 μstatic = 0.37

What is the force of friction acting on the box?

FF= mu x FN

## The Attempt at a Solution

64.7 x 9.81 = 634.707
0.19 x 634.707 = 120.69

Computer is telling me that it is incorrect

You should work with units (maybe that’s the problem already?). For the dynamic friction I get 120.59 N - assuming the box is on a horizontal surface. There are other things given, it looks like the problem is more than that single question.

What kind of angles are T1 and T2? What is F? What is the complete statement of the problem?

T1= 22.5
T2=54.1
F=2327.9N

The statement is finding the force of friction on a box on a slope in the horizontal direction

What are T1 and T2? Not their values, but what is their meaning?

Is there a sketch of the setup?

mfb said:
What are T1 and T2? Not their values, but what is their meaning?

Is there a sketch of the setup?

T1 & T2 are angles T1 is the angle of the slope at the bottom
and T2 is the angle off of the box where F is coming off of

Which slope?
We don't have a crystal ball. If you don't show the full problem statement, it is impossible to help.

## 1. What is the definition of friction force?

The friction force is a resistive force that occurs when two surfaces come into contact and slide against each other. It is caused by the microscopic roughness of the surfaces and is influenced by factors such as the materials, weight, and motion of the objects.

## 2. What are the types of friction force?

There are four types of friction force: static, sliding, rolling, and fluid friction. Static friction occurs when two surfaces are not moving relative to each other, sliding friction occurs when two surfaces are sliding against each other, rolling friction occurs when an object is rolling over a surface, and fluid friction occurs when an object moves through a fluid medium, such as air or water.

## 3. How is friction force calculated?

The magnitude of friction force can be calculated using the formula F = µN, where µ is the coefficient of friction and N is the normal force between the two surfaces. The coefficient of friction is a dimensionless value that depends on the materials and surface conditions of the objects in contact.

## 4. Why is friction force important?

Friction force is important because it helps us to walk, drive, and perform many other everyday tasks. Without friction, objects would not be able to maintain their position or move in a controlled manner. It also plays a crucial role in various industrial processes and can be both beneficial and detrimental depending on the situation.

## 5. How can the effects of friction force be reduced?

The effects of friction force can be reduced by using lubricants, such as oil or grease, between the surfaces in contact. Lubricants create a thin layer between the surfaces, reducing the contact area and thus decreasing the friction force. Additionally, using smoother and more polished surfaces can also help reduce friction.

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