Question

A car is moving in a circular path with a constant speed. Choose the INCORRECT statement.

• A. The person sitting in the car is in circular motion.
• B. The wheel of the car follows both oscillatory and periodic motion.
• C. The wheel of the car follows both rotatory and periodic motion.
• D. The person sitting in the car is stationary with respect to the driver.

Answer 1

The correct option is B The wheel of the car follows both oscillatory and periodic motion.

As the car is moving in a circular path the person sitting inside the car will also exhibit circular motion.
The wheel of the car is rotating about its own axis so it will follow rotatory motion.
Since the car is moving with a constant speed, the wheel will repeat its rotatory motion at regular intervals. Thus, it will also exhibit periodic motion.
Two objects moving with the same speed are stationary with respect to each other. The person sitting inside the car and the driver, both are moving at the same speed (speed of the car). Thus, they are stationary with respect to each other.
An object is said to exhibit oscillatory motion if it follows to and fro motion about a fixed position. The wheel of the car is not following such a motion.