Question

A particle is in uniform circular motion. Related to one complete revolution of the particle, which among the stataments is incorrect ?

• A. Displacement of the particle is zero.
• B. Average speed of the particle is zero.
• C. Average velocity of the particle is zero.
• D. Average acceleration of the particle is zero.

Answer 1

The Correct Option is B

Given: 

A particle is in uniform circular motion, completing one full revolution.

Step 1: Understanding Key Concepts

• Displacement: The shortest distance between the initial and final positions. Since the particle returns to the same point, displacement is zero.
• Average Speed: Defined as total distance traveled divided by time. The total distance in one revolution is the circumference, which is not zero.
• Average Velocity: Defined as total displacement divided by time. Since displacement is zero, average velocity is also zero.
• Average Acceleration: Uniform circular motion has a centripetal acceleration, but over one complete revolution, the average acceleration vector sums to zero.

Step 2: Identifying the Incorrect Statement

The incorrect statement is:

"Average speed of the particle is zero." (since speed is always positive in motion).

Answer: The correct option is B.