I'm a class 12th student and this thought just struck me from nowhere.
Assume a situation where every human on this planet turns towards west. All of them start walking simultaneously in west direction (exactly west i.e. antiparallel to Earth's rotation and none of their paths cross each other).
As Earth spins from west to east would this activity cause the earth's rotation speed to increase?
(There is frictional force acting on the earth due to motion by nearly a billion people which should produce enough torque to increase angular velocity of the earth.)
p.s. If the magnitude of friction force not enough to rotate the earth then assume each person to weigh more than 100 kg.
Also if it does happen would earth remain in the same orbit around the sun with just increased angular velocity about axis? (or would path around the sun also change due to this? )
I would really appreciate an easy solution cause I am still in class 12th.