Question

Which of the following is a one-dimensional motion?

• A. Landing of a aircraft
• B. Earth revolving around the sun
• C. Motion of wheels of moving train
• D. Train running on a straight track

Answer 1

The correct option is D

Train running on a straight track

Explanation for correct option:

1. When a body moves in a straight line or along a particular direction is called a one-dimensional motion. For example, a moving train, a horse, a boy, or any other body travelling in a straight line.
2. A train travelling on a straight track represents one-dimensional motion.
3. Because the train moving on a straight track has the direction of motion along only X- axis.

Explanation for incorrect option(s):

A: Landing of a aircraft

1. The landing of aircraft is a two-dimensional motion. Because in this case the direction of motion is downward and along a straight line both
2. Two-dimensional motion is the term used to describe motion in a plane..

B: Earth revolving around the sun

The motion of the earth around the sun is two-dimensional.

C: Motion of wheels of moving train

1. The motion of a wheel is two-dimensional along.
2. Two-dimensional motion is the term used to describe motion in a plane.

Hence, the correct answer is option (D).