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Uniform Circular Motion (UCM) – Occurs when an object moves in a circle at constant speed.

Uniform Circular Motion (UCM) – Occurs when an object moves in a circle at constant speed. Is the object accelerating?. Yes, even though the object is not changing speed it is changing velocity because it changes direction. Tangential Velocity. Consider an object moving in UCM.

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Uniform Circular Motion (UCM) – Occurs when an object moves in a circle at constant speed.

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  1. Uniform Circular Motion (UCM) – Occurs when an object moves in a circle at constant speed. Is the object accelerating? Yes, even though the object is not changing speed it is changing velocity because it changes direction. Tangential Velocity

  2. Consider an object moving in UCM. Both triangles are isosceles. Since all three corresponding angles are congruent, the triangles are similar. Hence, corresponding sides are proportional.

  3. But since the object is moving at a constant speed

  4. What direction are the force and the acceleration? (Center Seeking) Centripetal Force – The inward directed net force acting on an object undergoing UCM Centripetal Acceleration – The inward directed acceleration of an object undergoing UCM

  5. You may have heard of... (Center Fleeing) A fictitious outward directed force only “felt” by an object moving in the accelerated reference frame of UCM. Centrifugal Force – Consider the lab apparatus Notice, no outward directed force. Only the inward directed tension force keeping the mass moving in UCM.

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