A ball attached to a string is being swung counterclockwise in a circle parallel to the ground. A В OD

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### Circular Motion and Centripetal Force

**Concept:**
A ball attached to a string is being swung counterclockwise in a circle parallel to the ground.

**Diagram Explanation:**
- The diagram shows a ball (represented by a red circle) attached to a string, swinging in a circular path.
- The circle is annotated with four points: A, B, C, and D, positioned equidistantly around the perimeter.
- A black line represents the string, with the ball at the end of it, illustrating the circular motion.
- Point A is at the top of the circle, B on the left side, C at the bottom, and D on the right side.
- There's also a green arrow labeled \(\vec{v}\), indicating the direction of the ball's velocity vector, which is tangent to the circular path at any given point.

**Questions:**

1. **What is the direction of acceleration of the ball at point C?**

    The direction of the acceleration of the ball at point C is towards the center of the circle. This type of acceleration is known as centripetal acceleration, which always points towards the center of the circular path.

2. **If the string was cut just as the ball passed through point D, in what direction would the ball travel?**

   If the string is cut just as the ball passes point D, the ball will travel in a straight line tangent to the circle at the point where the string was cut. At point D, this means the ball will move in a direction perpendicular to the radius at point D, following the direction of the green velocity vector \(\vec{v}\), which is tangent to the circle at point D and directed counterclockwise.

Understanding these principles helps to grasp the fundamentals of circular motion and the effect of centripetal force in maintaining the object in a curved trajectory.
Transcribed Image Text:### Circular Motion and Centripetal Force **Concept:** A ball attached to a string is being swung counterclockwise in a circle parallel to the ground. **Diagram Explanation:** - The diagram shows a ball (represented by a red circle) attached to a string, swinging in a circular path. - The circle is annotated with four points: A, B, C, and D, positioned equidistantly around the perimeter. - A black line represents the string, with the ball at the end of it, illustrating the circular motion. - Point A is at the top of the circle, B on the left side, C at the bottom, and D on the right side. - There's also a green arrow labeled \(\vec{v}\), indicating the direction of the ball's velocity vector, which is tangent to the circular path at any given point. **Questions:** 1. **What is the direction of acceleration of the ball at point C?** The direction of the acceleration of the ball at point C is towards the center of the circle. This type of acceleration is known as centripetal acceleration, which always points towards the center of the circular path. 2. **If the string was cut just as the ball passed through point D, in what direction would the ball travel?** If the string is cut just as the ball passes point D, the ball will travel in a straight line tangent to the circle at the point where the string was cut. At point D, this means the ball will move in a direction perpendicular to the radius at point D, following the direction of the green velocity vector \(\vec{v}\), which is tangent to the circle at point D and directed counterclockwise. Understanding these principles helps to grasp the fundamentals of circular motion and the effect of centripetal force in maintaining the object in a curved trajectory.
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