Frictional Force: Comparing Forces

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SUMMARY

The discussion focuses on the relationship between applied force and frictional force when pushing a chair across a carpet at a constant velocity of 0.5 m/s. It is established that when the chair moves at constant velocity, the applied force equals the frictional force, resulting in a net force of zero. If the applied force increases, it surpasses the kinetic frictional force, leading to acceleration of the chair. The reasoning presented is confirmed as correct by other participants in the discussion.

PREREQUISITES
  • Understanding of Newton's laws of motion
  • Knowledge of kinetic friction and its coefficient
  • Familiarity with concepts of net force and acceleration
  • Basic principles of force equilibrium
NEXT STEPS
  • Study the principles of Newton's second law of motion
  • Learn about the coefficient of kinetic friction and its applications
  • Explore force diagrams and free-body diagrams in physics
  • Investigate the effects of varying surface materials on frictional forces
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Students studying physics, educators teaching mechanics, and anyone interested in understanding the dynamics of forces and motion.

krackers
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Homework Statement



If you push a chair across a carpet at a constant velocity of 0.5 m/s, how does the force you are exerting on that chair compare with the force the force of friction? If you increase the force you are exerting, how does the new frictional force compare with the previous frictional force?

2. The attempt at a solution

Part I. Since there is a constant velocity there should be no acceleration. This means that the net force must be 0. Since there is clearly force applied in one direction, the frictional force oppose the applied force equally, so the frictional force is to the force that you apply to the chair.

Part 2. However, let's say you increase the force applied. Since the coefficient of kinetic friction is a constant, and since you were previously providing just enough force to balance the kinetic frictional force, and the force applied will be greater than the kinetic frictional force. Thus, due to the net force, the object will accelerate.

Is my reasoning correct?
 
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krackers said:

Homework Statement



If you push a chair across a carpet at a constant velocity of 0.5 m/s, how does the force you are exerting on that chair compare with the force the force of friction? If you increase the force you are exerting, how does the new frictional force compare with the previous frictional force?

2. The attempt at a solution

Part I. Since there is a constant velocity there should be no acceleration. This means that the net force must be 0. Since there is clearly force applied in one direction, the frictional force oppose the applied force equally, so the frictional force is to the force that you apply to the chair.

Part 2. However, let's say you increase the force applied. Since the coefficient of kinetic friction is a constant, and since you were previously providing just enough force to balance the kinetic frictional force, and the force applied will be greater than the kinetic frictional force. Thus, due to the net force, the object will accelerate.

Is my reasoning correct?

Yeah, it all sounds fine to me.
 

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