What is the coefficient of friction?

In summary, the problem involves a 500kg box being pushed at a constant velocity with an applied force of 8400N at an angle of 35 degrees below the horizontal. The goal is to determine the coefficient of friction between the floor and the box. The equation used is Ff = (coefficient of kinetic friction) * mass * gravity, and the answer is 0.71. It's important to note that the applied force is not equal to the friction force, but is a component of it. Additionally, the vertical component of the applied force affects the normal force. The i and j components of the 8400N force applied at the 35 degree angle must be found in order to solve the problem.
  • #1
alisong
1
0

Homework Statement



A 500kg box is being pushed across a floor, with an applied force of 8400N, at a constant velocity, at an angle of 35 degrees below the horizontal. What is the coefficient friction between the floor and the box.

Homework Equations



I really do not know where to start.

The Attempt at a Solution



I know that Ff= (coefficient of kinetic friction)*mass*gravity
and because it's at constant velocity Fp=Ff right?
the answer is 0.71
 
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  • #2
You understand the most important part already.

It's also important to realize though, that the applied force magnitude does not equal friction force, but it is a component of applied force that equals friction force.

Also, we have a vertical component of the applied force that will effect your normal force.

Can you find the i and j components of this 8400N force applied at your 35* angle?
 

Related to What is the coefficient of friction?

What is the coefficient of friction?

The coefficient of friction is a measure of the resistance between two surfaces in contact. It is a dimensionless number that indicates the amount of force required to move one surface past the other.

How is the coefficient of friction determined?

The coefficient of friction can be determined experimentally by measuring the force required to move one surface past the other. It can also be calculated by dividing the force of friction by the normal force between the two surfaces.

What factors affect the coefficient of friction?

The coefficient of friction can be affected by various factors such as the texture, material, and weight of the surfaces in contact. It can also be influenced by the presence of lubricants or contaminants.

What is the difference between static and kinetic friction?

Static friction refers to the force required to start an object in motion, while kinetic friction is the force required to keep the object in motion. The coefficient of static friction is typically higher than the coefficient of kinetic friction.

Why is the coefficient of friction important?

The coefficient of friction is important because it helps us understand the interactions between different surfaces and how they affect the movement of objects. It is also crucial in engineering and design processes to ensure the safety and efficiency of various systems.

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