Final answer:
The radial force in an apparatus with circular motion is provided by a central pivot or nail, a cord, or frictional force. Newton's third law of motion and the principle of centripetal force are crucial in maintaining the object in a curved path. The source of the radial force varies depending on the system, whether it is a simple wheel and axle mechanism or a vehicle turning on a road.
Step-by-step explanation:
The part of the apparatus that provides the radial force required for circular motion is typically a central pivot or nail, a cord, or frictional force, depending on the scenario described. In the context of circular motion on a frictionless table, the cord attached to a pivot point supplies the centripetal force, which is necessary to maintain the motion of the object in a curved path. Newtons's third law of motion plays a crucial role here, indicating that for every action, there is an equal and opposite reaction.
If the object in question was part of a simple machine like a wheel and axle, the effort arm (in this case, the wheel) would rotate around the fulcrum (the center of the axle), creating a force that acts on the rope wrapped around the axle. In this example, the source of radial force is the point that supports the rotation, which, combined with the applied force, delivers the necessary centripetal force to keep the system in uniform circular motion.
Moreover, in scenarios involving cars or objects moving along a curved path, the frictional force between the tires or the object and the ground may also provide the necessary centripetal force to maintain the curve. This is crucial during phenomena like a car taking a turn where the friction between the tires and the road supplies the centripetal force that prevents the vehicle from skidding out of the turn.