Centripetal force is the force that acts on an object moving in a circular path, directing it towards the center of the circle. It is responsible for keeping the object in its circular motion, and without it, the object would move in a straight line.
Centripetal force must be radial because it is directed towards the center of the circle, perpendicular to the object's velocity. This is necessary for the object to maintain its circular motion, as any force applied in a direction other than towards the center would cause the object to move off its circular path.
Centripetal force is caused by a combination of factors, such as tension, friction, or gravity. For example, when an object is attached to a string and spun around in a circle, the tension in the string acts as the centripetal force. In the case of planets orbiting the sun, gravity provides the necessary centripetal force.
No, centripetal force and centrifugal force are not the same. Centripetal force is the inward force that keeps an object in circular motion, while centrifugal force is the outward force that appears to push an object away from the center of its circular path. Centrifugal force is actually a perceived force and does not actually exist.
No, centripetal force must always act towards the center of the circle. This is because it is responsible for changing the direction of the object's velocity, keeping it on its circular path. If the force were to act in any other direction, the object would not be able to maintain its circular motion.