page_title: Centripetal force
section_title: Geometric proof for uniform circular motion
hierarchical_section_title: Centripetal force / Geometric proof for uniform circular motion
context_page_description: Centripetal force is an accelerating force that acts on any body that revolves around a centre. This force contributes to keeping the body in rotation. This force is always directed towards the centre.
  The opposite force is called centrifugal force. This is the force that acts on the body in a direction away from the centre, which contributes to making the body try to fly away. When you hold a rope with a heavy object attached to it, and rotate it around, the rope becomes tight and keeps the body from flying away. This is caused by centripetal force.
  An example is a roller coaster which uses centripetal force to accelerate the carts so they will keep going in a circular motion. Even if an object changes direction but maintains at a constant speed it still counts as acceleration.
context_section_description: In the figure to the right we define the displacement vector  to represent motion in a circle.  The magnitude of  is denoted as  and represents the radius of the particle's orbit.
caption: Uses vector subtraction and similar triangles to get a=v^2/R