To decide if an object is in motion or at rest, one must choose a reference point. If the object’s position changes relative to the reference point over time, it is in motion; if not, it is at rest.
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The paragraph explains that an object’s motion or rest is relative to the chosen reference point. Deepa observed that passengers appeared at rest when considering the bus as the reference, but in motion when comparing them to external objects.
When an orange drops from a tree, it initially moves downward due to gravity, following a curved path called a parabola. Although it primarily moves straight down, air resistance and other factors can cause slight deviations in its trajectory.
Examples of linear motion in my surroundings include a car driving straight on a road, a train moving along its tracks, and a person walking directly to a destination. Each instance involves movement along a straight path without deviation.
Swings and merry-go-rounds do not exhibit linear motion. Instead, swings exhibit periodic motion as they swing back and forth, while merry-go-rounds demonstrate rotational motion as they spin around a central point, both involving circular paths.