The Earth travels on its orbit at a speed of approximately 4400 km per hour. Why do we not feel this high speed ?

We do not feel the Earth's high orbital speed because we are moving in perfect unison with the planet and its atmosphere. According to the principles of relative motion, since everything on the Earth's surface is traveling at the same velocity, there is no relative difference to signal motion to our bodies [t5]. Humans do not sense constant velocity; we only perceive motion when there is a significant acceleration or change in speed [t2][t5]. While the Earth's orbit involves a change in direction (centripetal acceleration), the magnitude of this acceleration is approximately 0.006 m/s², which is well below the human threshold of perception (roughly 0.03 m/s²) [t2]. Consequently, our relative speed with respect to the Earth along its orbit is zero, making the motion imperceptible in our daily frame of reference [t4][t5].