The Earth's rotation does indeed impart a motion to its inhabitants, but the effects are not always apparent or easily perceivable. Here are a few reasons why we don't experience a constant sensation of motion or detect measurable centrifugal forces:
Inertia: Just as when you're inside a moving vehicle, your body tends to retain its state of motion unless acted upon by external forces. The rotational speed of the Earth is relatively constant, and since we are also rotating along with it, we share its motion. Consequently, we don't feel any noticeable forces due to our inertia.
Gravity: Gravity is the dominant force on Earth that keeps everything, including our bodies, firmly anchored to the surface. It pulls us towards the center of the Earth, counteracting the centrifugal force caused by the rotation. The gravitational force is much stronger than the centrifugal force, which is why we don't experience significant effects from the Earth's rotation.
Gradual acceleration: The Earth's rotation imparts a relatively gradual acceleration. The rotational speed at the Earth's equator is about 1670 kilometers per hour (1037 miles per hour), but the rate of acceleration is small. This gradual increase in velocity over a large radius reduces the perception of motion compared to, for example, being inside a spinning amusement park ride.
Familiarity and adaptation: Humans have lived on a rotating Earth for their entire existence. As a result, our bodies and senses have adapted to this constant motion. Our brains have become accustomed to the Earth's rotation, and we interpret it as the norm. Therefore, we do not typically feel a constant sensation of motion because it has become our baseline experience.
While we may not directly perceive the Earth's rotation, there are indirect ways to measure it, such as with sensitive scientific instruments or through observations of celestial bodies. The lack of a perceptible sensation of motion or detectable centrifugal forces is due to the factors mentioned above, primarily gravity and our adaptation to the Earth's rotation.