If a force always acts perpendicular to an object's direction of motion, that force cannot change the object's kinetic energy.

This is very good conceptual question and can clear your doubts regarding work-energy theorem.
Whenever force is perpendicular to the direction of the motion, work done by that force is zero.
According to work-energy theorem,
Work done by all the force = change in kinetic energy.

here, work done = 0.
Therefore,
0=change in kinetic energy
This means kinetic energy remains constant.
Hope this helps

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okpalawalter8 okpalawalter8 · Answer 2 · 2021-08-13T02:12:35+02:00

We have that the perpendicular Force acting on the object's direction of motion does not affect the the object's kinetic energy, Therefore Kinetic Energy cannot be changed in this context.

Kinetic energy

Kinetic energy is energy which a body possesses by virtue of being in motion.

Therefore

The perpendicular Force acting on the object does not affect the Speed or motion of the object therefore cannot affect the work done and if the work done on the object is 0, therefore the change in kinetic energy is 0

In conclusion

The perpendicular Force acting on the object's direction of motion does not affect the the object's kinetic energy

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