**Correct Option: C. There is a net inward force acting on the car, which provides the necessary centripetal force.** ### Detailed Explanation: When a car travels in a circular path at a constant speed, it is undergoing uniform circular motion. Although the speed of the car remains constant, its direction is continuously changing. This change in direction means that the car is accelerating, even though its speed does not change. 1. **Understanding Centripetal Force:** - In circular motion, an object must have a net force directed towards the center of the circle to keep it moving in that circular path. This inward force is known as the **centripetal force**. - The centripetal force is not a separate force but rather the net force resulting from other forces acting on the object. For a car, this force can be provided by friction between the tires and the road, tension in a string (if applicable), or other forces depending on the scenario. 2. **Why Option C is Correct:** - Option C states that there is a net inward force acting on the car, which provides the necessary centripetal force. This is correct because, without this inward force, the car would not be able to maintain its circular path and would instead move off in a straight line due to inertia (as described by Newton's first law of motion). - The inward force is crucial for maintaining circular motion, and it is this force that keeps the car from skidding off the road. ### Why the Other Options are Incorrect: - **Option A: The net force is zero since the speed is constant.** - This statement is incorrect because while the speed is constant, the direction of the velocity vector is changing. In physics, acceleration occurs whenever there is a change in velocity, which includes changes in direction. Therefore, there must be a net force acting on the car to cause this acceleration, meaning the net force cannot be zero. - **Option B: The centripetal force is directed outward, away from the center of the circle.** - This statement is fundamentally incorrect. The centripetal force is always directed inward, towards the center of the circular path. The confusion may arise from the concept of "centrifugal force," which is a perceived force that seems to push objects outward when in a rotating reference frame. However, this is not a real force acting on the car; it is a result of inertia. - **Option D: The only force acting on the car is gravitational force; no other forces are involved.** - This statement is misleading. While gravitational force does act on the car (pulling it downwards), it is not the only force involved in circular motion. For the car to maintain its circular path, there must be a frictional force acting horizontally towards the center of the circle. Thus, gravitational force alone cannot account for the car's circular motion. ### Summary of Key Points: - In circular motion, a net inward force (centripetal force) is required to keep the object moving in a circle. - The centripetal force is directed towards the center of the circle, not outward. - Constant speed does not imply zero net force; direction change indicates acceleration. - Other forces, such as friction, play a crucial role in providing the necessary centripetal force for circular motion. This understanding is essential for analyzing problems related to circular motion in physics, ensuring a solid grasp of the concepts involved.