Integrating F.dx: Constant μ, m & g Affect Force?

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In summary, the friction force is not affected by integration because the constants μ, m, and g are all constant and the force of friction remains the same at every point along the path. This results in the integration being equivalent to multiplying the constant force by the distance. However, in reality, the force of friction may vary slightly.
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Hesperides
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I'm sure this is an easy question to answer - per the attached image, can someone please explain why the friction force has not required/been affected by integration?

My calculus is very rusty but the only reason I can think of is that μ, m and g are all constants (for the purposes of the question) and so x^1 drops in as a result of integrating x^0 - is that correct?
 

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  • #2
Yup. The force of friction is the same at every point along the path for the reasons that you stated. Since integration is just adding up all of those amounts of friction at each point, it is the same as multiplying it by [itex]x[/itex]. In reality, as you can probably guess, the force of friction would not actually be totally constant, but the fluctuations are very small (unless you allow the block to stop at some point at which point you would need to worry about static friction).
 
  • #3
Great! Thanks Drew
 
  • #4
It's a line integral over a distance x2 - x1...

so the constants may be moved outside the integral leaving just the displacement.
 
  • #5


I can confirm that your understanding is correct. In this scenario, the friction force is not affected by integration because the variables μ, m, and g are all considered to be constants. When integrating x^0, the result is simply x, which is then multiplied by the constant μ, m, and g. Since these are all constants, the friction force remains unchanged and does not require further integration. This is because integration is used to find the total change in a variable over a given range, but in this case, the variables are already constants and do not change over the given range. Therefore, the integration process does not affect the friction force.
 

FAQ: Integrating F.dx: Constant μ, m & g Affect Force?

How does constant μ affect force in an integrated F.dx system?

Constant μ, also known as the coefficient of friction, is a measure of the resistance between two surfaces in contact. In an integrated F.dx system, a higher coefficient of friction will result in a greater resistance to motion, leading to an increased force required to move the object.

How does the mass of an object affect the force in an integrated F.dx system?

In an integrated F.dx system, the mass of an object plays a significant role in determining the force required to move the object. According to Newton's Second Law of Motion, the force applied to an object is directly proportional to its mass. Therefore, the greater the mass of an object, the greater the force required to move it.

How does gravity (g) affect the force in an integrated F.dx system?

Gravity, denoted as g, is a constant force that pulls objects towards the center of the Earth. In an integrated F.dx system, gravity affects the force required to move an object by adding to the overall force of friction. This means that objects will require more force to move against the force of gravity.

How does the distance (dx) an object is moved affect the force in an integrated F.dx system?

The distance an object is moved, denoted as dx, is an important factor in an integrated F.dx system. According to the formula F = μmgx, the force required to move an object is directly proportional to the distance it is moved. This means that the further an object needs to be moved, the greater the force required.

Why is it important to consider all three variables (μ, m, and g) when integrating F.dx in a force system?

Integrating F.dx involves considering the effects of friction, mass, and gravity on the force required to move an object. These three variables are interdependent and affect each other in determining the overall force needed to move an object. Therefore, it is crucial to consider all three variables when integrating F.dx to accurately calculate and predict the required force in a system.

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