Answer:
The Earth spins on its axis once in 24 hours. Anything that is being spun in a circle, like a stone tied on the end of a piece of string, experiences an apparent force trying to fling it outwards. This is called centrifugal force (or centripetal - I’m not going to get into the argument here that people often have about whether it’s a ‘real’ force or not) and it arises from the fact that a body in motion wishes to continue in a straight line - unless a force acts upon it. In the case of a stone being twirled around on the end of a buit of string, the string transmits the force of the hand that is holding the string and pulls inward on the stone, forcing it to travel in a circle around the person.