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

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For an object to maintain a constant velocity, the forces acting on it must be balanced, meaning the applied force equals the frictional force, resulting in zero net force and zero acceleration. While no work is done on the object at constant speed, energy is still required to overcome friction, which converts to heat. The discussion clarifies that when an object is pushed, it continues moving until another force acts on it, and the applied force remains as long as the object is in motion. In scenarios with friction, work must be done to maintain speed, necessitating continuous energy input, such as fuel for a car. Understanding these dynamics helps clarify common misconceptions about force and motion.
  • #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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