Physics
Grade-9
Easy

Question

The rectilinear motion is represented by which one of the given examples?

  1. The wheels of a running car.
  2. The wheels of a moving bicycle.
  3. The minutes hand of a clock.
  4. A ball rolling on the ground.

Hint:

When we require only one co-ordinate axis and time to describe a particle’s motion, it is said to be in linear motion or rectilinear motion

The correct answer is: The minutes hand of a clock.


    When we require only one co-ordinate axis and time to describe a particle’s motion, it is said to be in linear motion or rectilinear motion. Examples of linear motion are a parade of soldiers, a train moving along a straight line, and many more.
    During the rolling of ball on the ground, the center of mass of the ball exhibits translational (rectilinear) motion whereas the ball exhibits rotational motion in center of mass frame. Thus rolling of ball on the ground is the instance of rectilinear motion as well as rotational motion.

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