Show that an object which is stationary with respect to the surface of the Earth is experiencing a gravitational force Ft=(-gmR/r)-[m(w*(w*R))] where R is a vector pointing from the centre of Earth to a position on the surface of the Earth, r is the radius of Earth and w is the angular velocity. i recognise that [m(w*(w*R))] is the coriolis force but i have no idea which direction it is pointing at. Is it suppose to point to the centre of the Earth? By the way can someone explain what is angular velocity? I know that its the rate of change of radian per unit time but in 3D they said you can use the right hand rule to find the direction of the angular velocity? What does that mean? Isn't angular velocity just the change of radian per unit time? Why is there a direction?I can't seem to link it up with the fact that it is a vector quantity.