A+Force+towards+the+Center

Look at the runner taking the bend.

While his body is tilted, what he is doing with his leg?

While pushing the earth backward he is also now pushing the earth sideways.

If you give a careful look at the image you will notice that the leg is pushing the earth exactly away from the center of the circular track the runner is moving on.



Then, the reaction force will appear on the runner. As the action force is directly away from the center of the circle, the reaction force will be directly towards the center of the circle.

Look at the kids in the picture who are trying to run around the plastic bowls.

They push the earth away from the circle, they are trying to make. Then they move around with the support of the force earth is applying on they towards the center of the circle.




 * Then, runners also (like the hammer) need a force acting on them towards the center of the circle in order to move along the circle of to make a circular turn.

Now it is easy to recognize what happened to bikers when they take the bend



In the tilted position bike tire pushes against the earth exactly away from the center of the circle the bike is trying to move along. Then the reaction force appear on the bike towards the center of the circle.

Note that it is the friction of the road which is providing the reaction force.

You know if the road is slippery (less friction), a bike tilted in this manner will be slipped off the road.

Now you should be able to recognize that, the same principle is applied to the horses when they take the bend.

The horses are pushing against the earth in the outward direction of the circle, and then the earth will apply an inward push on the horse.

What all these examples teach us?

Any object (or a living being) moving in a circle or in parts of a circle, performs that task while experiencing a fore directed towards the center of the circle.

This is a unique property of objects in circular motion.

Without this force objects never able to perform a circular motion.
 * You noticed in the example of hammer throwing, just at the moment the force is removed by releasing the chain the hammer goes off from the circle and move in a straight path.
 * If the road is slippary

With the idea, acting towards the center, the force required by an object to perform a motion along a circular path is called ‘Centripetal Force’