Kinetic Energy when the Force is Perpendicular to Velocity

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SUMMARY

The discussion centers on the relationship between force and kinetic energy when the force is always perpendicular to the velocity of a particle. According to the work-energy theorem, the work done by the force is zero, leading to the conclusion that the kinetic energy remains constant. This is confirmed by the fact that a perpendicular force does not have a component along the direction of the velocity vector, thus not altering the particle's speed. Therefore, the kinetic energy of the particle remains unchanged throughout its motion.

PREREQUISITES
  • Understanding of the work-energy theorem
  • Basic knowledge of vector components
  • Familiarity with the concept of kinetic energy
  • Knowledge of motion in a plane
NEXT STEPS
  • Study the implications of the work-energy theorem in different scenarios
  • Explore the effects of non-perpendicular forces on kinetic energy
  • Investigate the relationship between force, velocity, and acceleration
  • Learn about energy conservation principles in physics
USEFUL FOR

Students of physics, educators teaching mechanics, and anyone interested in the principles of motion and energy conservation.

Vavi Ask
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Homework Statement


Given, force of constant magnitude, which is always perpendicular to the velocity of the particle & the motion takes place in a plane. What happens to its kinetic energy? Explain.

Homework Equations


Work energy theorem

The Attempt at a Solution


According to work energy theorem, the work done turns out to be zero. This implies that the change in kinetic energy is zero i.e. the kinetic energy is constant.
 
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Yes, this is completely correct. The change in kinetic energy is zero.
 
Clever Penguin said:
Yes, this is completely correct. The change in kinetic energy is zero.
But there is a problem. Can we answer this question in other words where this work energy theorem is not used?
 
Vavi Ask said:
But there is a problem. Can we answer this question in other words where this work energy theorem is not used?
Since force is perpendicular to the velocity, it has no component along the direction of the velocity vector. This means the force can't change the magnitude of the velocity. Hence, it remains constant.
 
cnh1995 said:
Since force is perpendicular to the velocity, it has no component along the direction of the velocity vector. This means the force can't change the magnitude of the velocity. Hence, it remains constant.
Thanks a lot sir.
 

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