Question about Inertia: Force to Overcome Mass of 1kg?

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    Inertia
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Discussion Overview

The discussion revolves around the concept of inertia and the force required to overcome it for a mass of one kilogram. Participants explore the relationship between force, mass, and acceleration, as well as the implications of friction in practical scenarios.

Discussion Character

  • Conceptual clarification
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the specific force needed to overcome the inertia of a 1 kg mass, suggesting a desire for a quantifiable measure.
  • Another participant explains that the force required depends on the desired acceleration, referencing Newton's second law, and provides an example involving 1 Newton of force for 1 m/s² acceleration.
  • A subsequent participant acknowledges a misunderstanding of the initial question, indicating that the inquiry may have been based on incorrect assumptions.
  • Another participant clarifies that there is no measure of force to overcome inertia that is independent of acceleration.
  • One participant notes the counter-intuitive nature of the relationship between force and mass, particularly in everyday contexts where friction plays a significant role.
  • A different participant suggests that the question may pertain to the force needed to initiate movement from a stationary position, indicating that this force is related to static friction and weight.

Areas of Agreement / Disagreement

Participants express differing views on the nature of the force required to overcome inertia, with some focusing on acceleration and others on frictional forces. The discussion does not reach a consensus on a singular measure of force independent of these factors.

Contextual Notes

Participants mention the influence of friction in real-world scenarios, which complicates the understanding of inertia and the force required to initiate movement. There are also references to the distinction between weight and mass, which may affect calculations.

Macrobe
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I have a question regarding Inertia. Exactly how much force, in Newtons, is required to overcome the inertia of exactly one kilogram of mass? It seems to me there must be some sort of quantity for it.
 
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It depends on how fast you want to accelerate the object. The equation is ##\vec{F_{Net}} = m\vec{a}##, or in words, (net force acting on the object) = (mass of the object) x (acceleration of the object). This is Newton's second law. It takes, for example, 1 Newton of force to accelerate a 1kg object at 1m/s2.
 
Ah. Okay...not exactly what I was looking for, but what I was looking for was probably wrong ;) thanks.
 
Yes, if you were looking for some measure of a force required to overcome inertia that is independent of acceleration, then there's no such thing.
 
yeah, it is pretty counter-intuitive that f=ma, because in our everyday lives, most of the time there are frictional forces.
 
I think Macrobe meant to ask how much force would be required to get a body off its stationary position. On a flat surface, it is equal to the co-efficient of static friction x Weight of the body (weight, not mass). If the body is on, say, a road, the force required to get the body would be around 0.7 times the weight of the body.
 

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