So... how do y'all explain centripetal acceleration?
Centripetal acceleration is a term that describes acceleration in the centripetal (latin: "center seeking") direction. Since acceleration is, by definition, a change in velocity over time, and velocity is, by definition, change in displacement over time, thus the three ways to change velocity, and thus induce acceleration, are by increasing speed, decreasing speed, or changing the vector direction of velocity. Therefore when an object is rotating, other objects on its periphery experience acceleration due to rotational movement.
Deriving this centripetal acceleration based on the blasphemous non-flat-earth numbers is relatively easy. Centripetal acceleration is calculated as the magnitude of velocity squared divided by radius. Using F=ma, this centripetal acceleration can be used to calculate a centripetal force of around 2 N on a 60 kg person.
Because of this centripetal acceleration, earth is not an inertial frame of reference. Therefore, if the earth is round, we should be able to find apparent violations of Newton's inertial laws. The most sensitive equipment can detect this, and even simpler, this can be witnessed by dropping an object from near-atmosphere, or even as low as planes. Even adjusting for wind and air resistance, the ball should wanders from the location it should strike in the absence of centripetal acceleration.
So... is centripetal force just a lie?