Gravitational Force and Force of Gravity

Gravitational forces point from Earth's surface toward its center. Their lengths represent local gravitational field strength. The centrifugal effect is caused by inertia. Everything on the rotating Earth tries to keep moving in a straight line and fly off into Space. The force of gravity continuously changes this direction of motion, making objects move in circles around Earth's rotation axis. The final force which affects the bodies on the earth surface has different magnitude and direction on different places because of the centrifugal effect. On the equator, it is smaller than near the poles.