Ok so my teacher has recently covered this chapter, but one of the

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The discussion centers on the concept of forces acting on an object experiencing zero acceleration, specifically the balance between applied force and frictional force. It is established that for an object to maintain constant velocity, the applied force must equal the frictional force, resulting in no net force and thus no acceleration. The conversation also clarifies that work is done against friction when maintaining constant speed, as energy is required to overcome this resistance. Participants emphasize that kinetic energy remains constant when no net work is done on the object.

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  • #31


But harrylin, in this case I assuming the applied force and frictional force to be equal in magnitude .
 
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  • #32


Celluhh said:
But harrylin, in this case I assuming the applied force and frictional force to be equal in magnitude .
Exactly-that's my equation 3. When your car creates a friction force equal in magnitude to its driving force, then its speed will be constant.
 
  • #33


Yeah I know, but why is it so? Basically what I'm asking is where does the car get the kinetic energy from to keep it moving at constant speed ? The kinetic energy it has from the constant applie force had already been used to deal with the equal in magnitude constant friction force , so where does the extra energy come from ?
 
  • #34


Oh and to deviate a little, on a stairxase, which is the point at which a person has the most kinetic energy?
 
  • #35


@sophiecentaur, what do you mean ?
 

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