In case of uniform circular motion which of the following physical quantity do not remain constant

Options

A. kinetic energy
B. potential energy
C. restoring force
D. Frequency

Explanation

To solve the question regarding uniform circular motion and identify which physical quantity does not remain constant, we can follow these steps:

### Step 1: Understand Uniform Circular Motion
In uniform circular motion, an object moves in a circular path with a constant speed. However, even though the speed is constant, the direction of the velocity vector is continuously changing.

### Step 2: Identify Physical Quantities
The main physical quantities to consider in uniform circular motion are:
- Speed
- Velocity
- Acceleration
- Angular velocity
- Centripetal force

### Step 3: Analyze Each Quantity
1. **Speed**: The magnitude of speed remains constant in uniform circular motion.
2. **Velocity**: Velocity is a vector quantity that includes both speed and direction. Since the direction of the object is continuously changing, the velocity does not remain constant.
3. **Acceleration**: In uniform circular motion, there is always a centripetal acceleration directed towards the center of the circular path. Although its magnitude remains constant, the direction changes.
4. **Angular Velocity**: The angular velocity remains constant as the object moves around the circle at a uniform rate.
5. **Centripetal Force**: The centripetal force is dependent on the mass of the object and the square of its speed divided by the radius of the circular path. Since speed is constant, the centripetal force also remains constant.

### Step 4: Conclusion
From the analysis, the physical quantity that does not remain constant in uniform circular motion is **velocity** due to its changing direction.

### Final Answer
In uniform circular motion, the physical quantity that does not remain constant is **velocity**.

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