The lifting of an object up and down, the parade of an army and the free fall of a heavy object are all examples of which motion?

Rectilinear motion

The correct answer is option 1. Rectilinear motion.

The lifting of an object up and down, the parade of an army, and the free fall of a heavy object are all examples of rectilinear motion.

Rectilinear motion, also known as translational motion, occurs when an object moves along a straight line path. It is characterized by the object's displacement along a single dimension, typically represented by distance or position over time.

In the examples provided:

Lifting an object up and down involves vertical rectilinear motion.

The parade of an army involves horizontal rectilinear motion.

The free fall of a heavy object, under the influence of gravity, also follows rectilinear motion along a vertical path.

Rectilinear motion contrasts with other types of motion such as periodic motion (repetitive motion about a fixed point), rotational motion (motion about an axis), and oscillatory motion (back-and-forth motion around a central point).